PYIC-7872: Revert PYIC-7872 specific code

Author: MikeCollingwood

.github/workflows/secure-post-merge.yml

@@ -39,7 +39,7 @@ jobs:
   build-test-images-if-needed:
     needs: check-if-api-tests-changed
     if: ${{ needs.check-if-api-tests-changed.outputs.api-tests-changed == 'true' }}
-    uses: govuk-one-login/ipv-core-back/.github/workflows/secure-pipeline-api-tests-image.yml@pyic-7872
+    uses: govuk-one-login/ipv-core-back/.github/workflows/secure-pipeline-api-tests-image.yml@main
     with:
       environment: ${{ github.event_name == 'workflow_dispatch' && 'dev01' || 'build' }}
     secrets: inherit # pragma: allowlist secret

deploy/template.yaml

@@ -15,7 +15,7 @@ Globals:
     Environment:
       Variables:
         ENVIRONMENT: !Sub "${Environment}"
-        CONFIG_SOURCE: "app-config"
+        CONFIG_SOURCE: "ssm"
         APP_CONFIG_ID: !Sub "core-back-${Environment}"
         APP_CONFIG_ENVIRONMENT_ID: !Sub "core-back-${Environment}"
         APP_CONFIG_PROFILE_ID: !Sub "core-back-${Environment}"