[CI] Add workflow for building image on release (#243)

* add workflow for building image on release

* remove manual trigger and use different variable to access release tag name

.github/workflows/build_docker_on_release.yml

@@ -0,0 +1,30 @@
+name: build Docker image on release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+      -
+        name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      -
+        name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ secrets.DOCKERHUB_USERNAME }}/api:stable, ${{ secrets.DOCKERHUB_USERNAME }}/api:${{ github.event.release.tag_name }}