Create docker image on release

.github/workflows/docker.yml

@@ -3,6 +3,8 @@ name: Docker
 on:
   push:
     branches: [ master ]
+  release:
+    types: [ created ]
 
 jobs:
   build:
@@ -15,7 +17,7 @@ jobs:
         uses: docker/setup-buildx-action@v1
 
       - name: Login to DockerHub
-        uses: docker/login-action@v1 
+        uses: docker/login-action@v1
         with:
           username: ${{ secrets.REGISTRY_USERNAME }}
           password: ${{ secrets.REGISTRY_PASSWORD }}
@@ -24,4 +26,4 @@ jobs:
         uses: docker/build-push-action@v2
         with:
           push: true
-          tags: esanchezm/prometheus-qbittorrent-exporter:latest
+          tags: esanchezm/prometheus-qbittorrent-exporter:latest,esanchezm/prometheus-qbittorrent-exporter:$GITHUB_REF