Add postgresql container image for the GH CI

In order to avoid OBS rebuild issues, add an empty shell on top of the
postgresql image for GH CI to use.

Author: cbosdo

.github/workflows/build_containers.yml

@@ -283,3 +283,34 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+
+  build-and-push-postgresql-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}/ci-postgresql
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: ./testsuite/dockerfiles/postgresql/
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

testsuite/dockerfiles/postgresql/Dockerfile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: MIT
+FROM registry.opensuse.org/systemsmanagement/uyuni/master/containers/uyuni/server-postgresql:latest
+
+ENTRYPOINT ["/usr/local/bin/uyuni-entrypoint.sh"]
+CMD ["postgres"]