Check that Docker latest tag is correct

.github/workflows/check_docker_latest.yml

@@ -0,0 +1,28 @@
+---
+name: Check newly released Docker image with current semantic version tag is also tagged with latest
+on:  # yamllint disable-line rule:truthy
+  push
+
+jobs:
+
+  check_latest_tag:
+    runs-on: ubuntu-22.04
+    env:
+      repo: agilepathway/pull-request-label-checker
+      image_ver: v1.6.13
+    steps:
+
+      - name: Check Docker image for new release is tagged latest
+        id: check_docker_image_tagged_latest
+        # yamllint disable rule:line-length
+        run: |
+          docker pull ${{env.repo}}:${{ env.image_ver }}
+          echo "IS_LATEST_TAGGED_CORRECTLY=$(docker image inspect ${{env.repo}}:${{ env.image_ver }} | jq -r '.[] | (.RepoTags) | any( . == "${{env.repo}}:latest") ')" >> "$GITHUB_OUTPUT"
+        # yamllint enable rule:line-length
+
+      - name: Fail if latest is not tagged correctly
+        if: ${{ steps.check_docker_image_tagged_latest.outputs.IS_LATEST_TAGGED_CORRECTLY == 'false' }}
+        uses: actions/github-script@v7
+        with:
+          script: |
+                core.setFailed('The newly released Docker image ${{ env.image_ver }} is not tagged latest. ')