version dockerhub readme and update it automatically on release

.github/workflows/dockerhub.yml

@@ -0,0 +1,18 @@
+name: Update Docker Hub Description
+
+on: release
+
+jobs:
+  dockerHubDescription:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Docker Hub Description
+        uses: peter-evans/dockerhub-description@v4
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          repository: athou/commafeed
+          short-description: ${{ github.event.repository.description }}
+          readme-filepath: commafeed-server/src/main/docker/README.md