cleanup the image

infrastructure/docker/image/resources/install.sh

@@ -1,5 +1,6 @@
 #!/bin/bash
 
+function main() {
     apt-get update > /dev/null;
     apt-get install -qqy ca-certificates curl wget gnupg > /dev/null
     sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt focal-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
@@ -13,3 +14,9 @@ update-ca-certificates
     install -m 0400 /tmp/functions.sh /usr/local/lib/
     install -m 0400 /tmp/pg-functions.sh /usr/local/lib/
     install -m 0400 /tmp/file-functions.sh /usr/local/lib/
+
+    cleanupDocker
+}
+
+source /tmp/install_functions.sh
+main