Revert "Try copying credentials.yml.postgresql directly"

This reverts commit 7987d79.

.github/workflows/postgres.yml

@@ -67,7 +67,7 @@ jobs:
     - name: 'Setup Credentials'
       run: |
         # generate a default credential file and key
-        cp config/credentials.yml.postgresql config/credentials.yml.enc
+        EDITOR='echo "$(cat config/credentials.yml.postgresql)" >' bundle exec rails credentials:edit
 
     # Set the path to the wkhtmltopdf executable
     - name: 'Determine wkhtmltopdf location'