Update github workflow

fix

.github/workflows/docker-publish.yml

@@ -29,7 +29,7 @@ jobs:
     needs: test
 
     runs-on: ubuntu-latest
-    if: github.event_name == 'push'
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
 
     steps:
       - uses: actions/checkout@v2
@@ -42,3 +42,12 @@ jobs:
           tag_with_ref: true
           add_git_labels: true
           push: ${{ startsWith(github.ref, 'refs/tags/') }}
+
+      - uses: docker/build-push-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: snegov/seafile-client
+          tags: latest
+          add_git_labels: true
+          push: ${{ startsWith(github.ref, 'refs/tags/') }}