run workflow on release is created

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

@@ -1,9 +1,9 @@
 name: build docker image and push to docker hub
 
 on:
-  push:
-    tags:
-      - '*'
+  release:
+    types: # This configuration does not affect the page_build event above
+      - created
 
 jobs:
   build:
@@ -16,8 +16,10 @@ jobs:
         uses: crazy-max/ghaction-docker-buildx@v1
         with:
           version: latest
+      - name: login to docker hub
+        run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
       - name: build the image
-      run: |
-        docker buildx build --push \
-          --tag shizunge/endlessh-go:latest \
-          --platform linux/amd64,linux/arm/v7,linux/arm64 .
+        run: |
+          docker buildx build --push \
+            --tag shizunge/endlessh-go:latest \
+            --platform linux/amd64,linux/arm/v7,linux/arm64 .