Update postgres to use strings instead of keywords

In config and auth.

src/main/cljc/dda/c4k_common/postgres.cljc

@@ -80,7 +80,7 @@
   [config pg-config?]
   (let [{:keys [pv-storage-size-gb pvc-storage-class-name] 
          :or {pv-storage-size-gb 10
-              pvc-storage-class-name :manual}} config]
+              pvc-storage-class-name "manual"}} config]
   (-> 
    (yaml/from-string (yaml/load-resource "postgres/pvc.yaml"))
    (assoc-in [:spec :resources :requests :storage] (str pv-storage-size-gb "Gi"))

src/test/cljc/dda/c4k_common/postgres_test.cljc

@@ -84,14 +84,14 @@
            :accessModes ["ReadWriteOnce"]
            :resources {:requests {:storage "20Gi"}}}}
          (cut/generate-pvc {:pv-storage-size-gb 20
-                            :pvc-storage-class-name :local-path}))))
+                            :pvc-storage-class-name "local-path"}))))
 
 (deftest should-generate-persistent-volume-claim-diff
   (is (= {:storageClassName-c1 "manual", :storageClassName-c2 "local-path",
           :storage-c1 "10Gi", :storage-c2 "20Gi"}
          (ct/map-diff (cut/generate-pvc {}) 
                         (cut/generate-pvc {:pv-storage-size-gb 20
-                                           :pvc-storage-class-name :local-path})))))
+                                           :pvc-storage-class-name "local-path"})))))
 
 (deftest should-generate-secret
   (is (= {:apiVersion "v1"