diff --git a/infrastructure/c4k-website-build/image/resources/entrypoint.sh b/infrastructure/c4k-website-build/image/resources/entrypoint.sh
index 39833e9..f2d61f7 100755
--- a/infrastructure/c4k-website-build/image/resources/entrypoint.sh
+++ b/infrastructure/c4k-website-build/image/resources/entrypoint.sh
@@ -7,6 +7,8 @@ source /usr/local/bin/functions.sh
 
 echo "Downloading website"
 get-and-unzip-website-data
+echo "Executing Custom Scripts, if applicable"
+execute-scripts-when-existing
 echo "Building website"
 build-and-extract-website
 echo "Moving files"
diff --git a/infrastructure/c4k-website-build/image/resources/functions.sh b/infrastructure/c4k-website-build/image/resources/functions.sh
index 60b673b..b4c0204 100644
--- a/infrastructure/c4k-website-build/image/resources/functions.sh
+++ b/infrastructure/c4k-website-build/image/resources/functions.sh
@@ -6,9 +6,27 @@ function get-and-unzip-website-data() {
     unzip $SOURCEDIR/$filename -d $BUILDDIR
 }
 
+function execute-scripts-when-existing {
+    if [[ -e $BUILDDIR/$SCRIPTFILE ]]
+        then 
+            checksum="$(sha256sum $BUILDDIR/$SCRIPTFILE)"            
+            if [[ "$SHA256SUM" == "$checksum" ]]
+                then
+                    /bin/bash $BUILDDIR/$SCRIPTFILE
+                else
+                    printf "Provided SHA256 Sum does not match calculated sum. Exiting."
+                    printf "Calculated SHA256: $checksum"
+                    printf "Given SHA256: $SHA256SUM"
+                    exit 1
+                fi
+    else
+        prinf "No script file provided, exiting."
+        exit 0
+    fi
+}
+
 function build-and-extract-website() {
     (cd $BUILDDIR; dir=$(ls); cd $dir; lein run;)
-    # websiteartifactname=$(ls target/ | grep -Eo "*.+\.war"); unzip target/$websiteartifactname
 }
 
 function move-website-files-to-target() {
diff --git a/src/main/cljc/dda/c4k_website/website.cljc b/src/main/cljc/dda/c4k_website/website.cljc
index 31dbf69..fc3e687 100644
--- a/src/main/cljc/dda/c4k_website/website.cljc
+++ b/src/main/cljc/dda/c4k_website/website.cljc
@@ -11,13 +11,15 @@
    [dda.c4k-common.base64 :as b64]
    [dda.c4k-common.predicate :as pred]
    [dda.c4k-website.ingress-cert :as ing]
-   [clojure.string :as str]))
+   [clojure.string :as str]
+   [clojure.string :as st]))
 
 (defn fqdn-list?
   [input]
   (every? true? (map pred/fqdn-string? input)))
 
 (s/def ::unique-name string?)
+(s/def ::sha256sum-output string?)
 (s/def ::issuer pred/letsencrypt-issuer?)
 (s/def ::volume-size pred/integer-string?)
 (s/def ::authtoken pred/bash-env-string?)
@@ -28,7 +30,7 @@
 (s/def ::username string?)
 
 (def websitedata? (s/keys :req-un [::unique-name ::fqdns ::gitea-host ::gitea-repo ::branchname]
-                          :opt-un [::issuer ::volume-size]))
+                          :opt-un [::issuer ::volume-size ::sha256sum-output]))
 
 (def websiteauth? (s/keys :req-un [::unique-name ::username ::authtoken]))
 
@@ -43,6 +45,14 @@
 (def config? (s/keys :req-un [::websites]
                      :opt-un [::issuer ::volume-size]))
 
+(defn-spec get-hash-from-sha256sum-output string?
+  [sha256sum-output string?]
+  (first (st/split sha256sum-output #" ")))
+
+(defn-spec get-file-name-from-sha256sum-output string?
+  [sha256sum-output string?]
+  (second (st/split sha256sum-output #" ")))
+
 (defn-spec replace-dots-by-minus string?
   [fqdn pred/fqdn-string?]
   (str/replace fqdn #"\." "-"))
@@ -163,29 +173,28 @@
      (replace-all-matching-subvalues-in-string-start "NAME" (replace-dots-by-minus unique-name))
      (cm/replace-all-matching-values-by-new-value "WEBSITESTORAGESIZE" (str volume-size "Gi")))))
 
-(defn-spec generate-website-build-cron pred/map-or-seq?
-  [config flattened-and-reduced-config?]
-  (let [{:keys [unique-name]} config]
+(defn-spec replace-build-data pred/map-or-seq?
+  [resource-file string?
+   config flattened-and-reduced-config?]
+  (let [{:keys [unique-name sha256sum-output]} config]
     (->
-     (yaml/load-as-edn "website/website-build-cron.yaml")
+     (yaml/load-as-edn resource-file)
      (assoc-in [:metadata :labels :app.kubernetes.part-of] (generate-app-name unique-name))
+     (cm/replace-all-matching-values-by-new-value "CHECK_SUM" (get-hash-from-sha256sum-output sha256sum-output))
+     (cm/replace-all-matching-values-by-new-value "SCRIPT_FILE" (get-file-name-from-sha256sum-output sha256sum-output))
      (replace-all-matching-subvalues-in-string-start "NAME" (replace-dots-by-minus unique-name)))))
 
-(defn-spec generate-website-initial-build-job pred/map-or-seq?
+(defn-spec generate-website-build-cron pred/map-or-seq?
   [config flattened-and-reduced-config?]
-  (let [{:keys [unique-name]} config]
-    (->
-     (yaml/load-as-edn "website/website-initial-build-job.yaml")
-     (assoc-in [:metadata :labels :app.kubernetes.part-of] (generate-app-name unique-name))
-     (replace-all-matching-subvalues-in-string-start "NAME" (replace-dots-by-minus unique-name)))))
+  (replace-build-data "website/website-build-cron.yaml" config))
+
+(defn-spec generate-website-initial-build-job pred/map-or-seq? 
+  [config flattened-and-reduced-config?]
+  (replace-build-data "website/website-initial-build-job.yaml" config))
 
 (defn-spec generate-website-build-deployment pred/map-or-seq?
   [config flattened-and-reduced-config?]
-  (let [{:keys [unique-name]} config]
-    (->
-     (yaml/load-as-edn "website/website-build-deployment.yaml")
-     (assoc-in [:metadata :labels :app.kubernetes.part-of] (generate-app-name unique-name))
-     (replace-all-matching-subvalues-in-string-start "NAME" (replace-dots-by-minus unique-name)))))
+  (replace-build-data "website/website-build-deployment.yaml" config))
 
 (defn-spec generate-website-build-secret pred/map-or-seq?
   [auth flattened-and-reduced-config?]
diff --git a/src/main/cljs/dda/c4k_website/browser.cljs b/src/main/cljs/dda/c4k_website/browser.cljs
index c050c2b..e78316f 100644
--- a/src/main/cljs/dda/c4k_website/browser.cljs
+++ b/src/main/cljs/dda/c4k_website/browser.cljs
@@ -31,19 +31,20 @@
        (cm/concat-vec
         (br/generate-input-field "issuer" "(Optional) Your issuer prod/staging:" "")
         (br/generate-text-area
-         "websites" "A collection containing fqdns and repo infos for each website:"
+         "websites" "Contains fqdns, repo infos, an optional sha256sum-output for script execution for each website:"
          "{:websites
           [{:unique-name \"test.io\",
             :fqdns [\"test.de\" \"www.test.de\"],
             :gitea-host \"githost.de\",
             :gitea-repo \"repo\",
-            :branchname \"main\"}
+            :branchname \"main\",
+            :sha256sum-output \"123456789ab123cd345de script-file-name.sh\"}
            {:unique-name \"example.io \",
             :fqdns [\"example.org\" \"www.example.org\"],
             :gitea-host \"githost.org\",
             :gitea-repo \"repo\",
             :branchname \"main\"}]}"
-         "10")))
+         "11")))
       (generate-group
        "credentials"
        (br/generate-text-area
diff --git a/src/main/resources/website/website-build-cron.yaml b/src/main/resources/website/website-build-cron.yaml
index 711fdb6..1c2bd00 100644
--- a/src/main/resources/website/website-build-cron.yaml
+++ b/src/main/resources/website/website-build-cron.yaml
@@ -16,10 +16,15 @@ spec:
           - image: domaindrivenarchitecture/c4k-website-build
             name: NAME-build-app
             imagePullPolicy: IfNotPresent
-            command: ["/entrypoint.sh"]            
+            command: ["/entrypoint.sh"]
             envFrom:
             - secretRef:
-                name: NAME-secret                   
+                name: NAME-secret
+            env:
+            - name: SHA256SUM
+              value: CHECK_SUM
+            - name: SCRIPTFILE
+              value: SCRIPT_FILE
             volumeMounts:
             - name: content-volume
               mountPath: /var/www/html/website
diff --git a/src/main/resources/website/website-build-deployment.yaml b/src/main/resources/website/website-build-deployment.yaml
index 5dec7b8..5b76ce4 100644
--- a/src/main/resources/website/website-build-deployment.yaml
+++ b/src/main/resources/website/website-build-deployment.yaml
@@ -25,7 +25,12 @@ spec:
         command: ["/entrypoint.sh"]        
         envFrom:
         - secretRef:
-            name: NAME-secret                   
+            name: NAME-secret  
+        env:
+        - name: SHA256SUM
+          value: CHECK_SUM
+        - name: SCRIPTFILE
+          value: SCRIPT_FILE                 
         volumeMounts:
         - name: content-volume
           mountPath: /var/www/html/website
diff --git a/src/main/resources/website/website-build-secret.yaml b/src/main/resources/website/website-build-secret.yaml
index 33bac32..405eaf8 100644
--- a/src/main/resources/website/website-build-secret.yaml
+++ b/src/main/resources/website/website-build-secret.yaml
@@ -6,5 +6,6 @@ metadata:
     app.kubernetes.part-of: NAME-website
 data:
     AUTHTOKEN: TOKEN
-    GITREPOURL: URL 
+    GITREPOURL: URL
+    
     
\ No newline at end of file
diff --git a/src/main/resources/website/website-initial-build-job.yaml b/src/main/resources/website/website-initial-build-job.yaml
index a66d461..ce44808 100644
--- a/src/main/resources/website/website-initial-build-job.yaml
+++ b/src/main/resources/website/website-initial-build-job.yaml
@@ -14,7 +14,12 @@ spec:
         command: ["/entrypoint.sh"]            
         envFrom:
         - secretRef:
-            name: NAME-secret                   
+            name: NAME-secret  
+        env:
+        - name: SHA256SUM
+          value: CHECK_SUM
+        - name: SCRIPTFILE
+          value: SCRIPT_FILE                 
         volumeMounts:
         - name: content-volume
           mountPath: /var/www/html/website
diff --git a/src/test/cljc/dda/c4k_website/website_test.cljc b/src/test/cljc/dda/c4k_website/website_test.cljc
index 33bba0e..65ca044 100644
--- a/src/test/cljc/dda/c4k_website/website_test.cljc
+++ b/src/test/cljc/dda/c4k_website/website_test.cljc
@@ -143,9 +143,7 @@
 (deftest should-generate-website-build-cron
   (is (= {:apiVersion "batch/v1beta1",
           :kind "CronJob",
-          :metadata {
-                     :name "test-io-build-cron", 
-                     :labels {:app.kubernetes.part-of "test-io-website"}},
+          :metadata {:name "test-io-build-cron", :labels {:app.kubernetes.part-of "test-io-website"}},
           :spec
           {:schedule "0/7 * * * *",
            :successfulJobsHistoryLimit 1,
@@ -160,22 +158,24 @@
                  :imagePullPolicy "IfNotPresent",
                  :command ["/entrypoint.sh"],
                  :envFrom [{:secretRef {:name "test-io-secret"}}],
+                 :env [{:name "SHA256SUM", :value "123456789ab123cd345de"} {:name "SCRIPTFILE", :value "script-file-name.sh"}],
                  :volumeMounts [{:name "content-volume", :mountPath "/var/www/html/website"}]}],
                :volumes [{:name "content-volume", :persistentVolumeClaim {:claimName "test-io-content-volume"}}],
                :restartPolicy "OnFailure"}}}}}}
-         (cut/generate-website-build-cron {:unique-name "test.io",
-                                           :gitea-host "gitea.evilorg",
-                                           :gitea-repo "none",
-                                           :branchname "mablain",
-                                           :fqdns ["test.de" "www.test.de" "test-it.de" "www.test-it.de"]
-                                           :username "someuser"
-                                           :authtoken "abedjgbasdodj"}))))
+         (cut/generate-website-build-cron {:authtoken "abedjgbasdodj",
+                                           :gitea-host "gitlab.de",
+                                           :username "someuser",
+                                           :fqdns ["test.de" "test.org" "www.test.de" "www.test.org"],
+                                           :gitea-repo "repo",
+                                           :sha256sum-output "123456789ab123cd345de script-file-name.sh",
+                                           :issuer "staging",
+                                           :branchname "main",
+                                           :unique-name "test.io"}))))
 
 (deftest should-generate-website-build-deployment
   (is (= {:apiVersion "apps/v1",
           :kind "Deployment",
-          :metadata {:name "test-io-build-deployment",
-                     :labels {:app.kubernetes.part-of "test-io-website"}},
+          :metadata {:name "test-io-build-deployment", :labels {:app.kubernetes.part-of "test-io-website"}},
           :spec
           {:replicas 0,
            :selector {:matchLabels {:app "test-io-builder"}},
@@ -190,15 +190,18 @@
                :imagePullPolicy "IfNotPresent",
                :command ["/entrypoint.sh"],
                :envFrom [{:secretRef {:name "test-io-secret"}}],
+               :env [{:name "SHA256SUM", :value "123456789ab123cd345de"} {:name "SCRIPTFILE", :value "script-file-name.sh"}],
                :volumeMounts [{:name "content-volume", :mountPath "/var/www/html/website"}]}],
              :volumes [{:name "content-volume", :persistentVolumeClaim {:claimName "test-io-content-volume"}}]}}}}
-         (cut/generate-website-build-deployment {:unique-name "test.io",
-                                                 :gitea-host "gitea.evilorg",
-                                                 :gitea-repo "none",
-                                                 :branchname "mablain",
-                                                 :fqdns ["test.de" "www.test.de" "test-it.de" "www.test-it.de"]
-                                                 :username "someuser"
-                                                 :authtoken "abedjgbasdodj"}))))
+         (cut/generate-website-build-deployment {:authtoken "abedjgbasdodj",
+                                                 :gitea-host "gitlab.de",
+                                                 :username "someuser",
+                                                 :fqdns ["test.de" "test.org" "www.test.de" "www.test.org"],
+                                                 :gitea-repo "repo",
+                                                 :sha256sum-output "123456789ab123cd345de script-file-name.sh",
+                                                 :issuer "staging",
+                                                 :branchname "main",
+                                                 :unique-name "test.io"}))))
 
 (deftest should-generate-website-initial-build-job
   (is (= {:apiVersion "batch/v1",
@@ -213,17 +216,19 @@
                :imagePullPolicy "IfNotPresent",
                :command ["/entrypoint.sh"],
                :envFrom [{:secretRef {:name "test-io-secret"}}],
+               :env [{:name "SHA256SUM", :value "123456789ab123cd345de"} {:name "SCRIPTFILE", :value "script-file-name.sh"}],
                :volumeMounts [{:name "content-volume", :mountPath "/var/www/html/website"}]}],
              :volumes [{:name "content-volume", :persistentVolumeClaim {:claimName "test-io-content-volume"}}],
              :restartPolicy "OnFailure"}}}}
-         (cut/generate-website-initial-build-job {:unique-name "test.io",
-                                                 :fqdns ["test.de" "test.org" "www.test.de" "www.test.org"],
-                                                 :gitea-host "gitlab.de",
-                                                 :gitea-repo "repo",
-                                                 :branchname "main",
-                                                 :username "someuser",
-                                                 :authtoken "abedjgbasdodj",
-                                                 :issuer "staging"}))))
+         (cut/generate-website-initial-build-job {:authtoken "abedjgbasdodj",
+                                                  :gitea-host "gitlab.de",
+                                                  :username "someuser",
+                                                  :fqdns ["test.de" "test.org" "www.test.de" "www.test.org"],
+                                                  :gitea-repo "repo",
+                                                  :sha256sum-output "123456789ab123cd345de script-file-name.sh",
+                                                  :issuer "staging",
+                                                  :branchname "main",
+                                                  :unique-name "test.io"}))))
 
 (deftest should-generate-website-build-secret
   (is (= {:name-c1 "test-io-secret",