Add the release tag to the docker image

.github/workflows/docker-hub-build-push.yml

@@ -18,8 +18,14 @@ jobs:
           version: latest
       - name: login to docker hub
         run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
-      - name: build the image
+      - name: build and push the latest image
         run: |
           docker buildx build --push \
             --tag shizunge/endlessh-go:latest \
             --platform linux/amd64,linux/arm/v7,linux/arm64 .
+      - name: extract tag string
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+      - name: tag image
+        run: docker tag shizunge/endlessh-go:latest shizunge/endlessh-go:$RELEASE_VERSION
+      - name: push tagged image
+        run: docker push shizunge/endlessh-go:$RELEASE_VERSION