Add postgres image to test

Author: nmlinaric

.github/workflows/test.yaml

@@ -30,6 +30,10 @@ jobs:
         run: docker pull hello-world:latest && docker tag hello-world:latest ghcr.io/nodefactoryio/github-packages-cleanup-sample:${{github.sha}}
       - name: push hello world image
         run: docker push ghcr.io/nodefactoryio/github-packages-cleanup-sample:${{github.sha}}
+      - name: tag postgres image
+        run: docker pull postgres-11-alpine && docker tag postgres-11-alpine ghcr.io/nodefactoryio/github-packages-cleanup-sample-2:${{github.sha}}
+      - name: push postgres image
+        run: docker push ghcr.io/nodefactoryio/github-packages-cleanup-sample-2":${{github.sha}}
       - name: Run cleanup action
         uses: ./
         id: deleted-packages