update publish docker workflow to run on published release

.github/workflows/publish-docker.yml

@@ -6,10 +6,8 @@ on:
       tag:
         description: 'docker tag'
         required: true
-  pull_request:
-    branches:
-      - 'test'
-      - 'master'
+  release:
+    types: [published]
 
 jobs:
   docker:
@@ -31,8 +29,7 @@ jobs:
         uses: docker/setup-qemu-action@v1
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
-      - if: github.event_name != 'pull_request'
-        name: Login to DockerHub
+      - name: Login to DockerHub
         uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
@@ -42,5 +39,5 @@ jobs:
         with:
           context: .
           platforms: linux/amd64, linux/arm64
-          push: ${{ github.event_name != 'pull_request' }}
+          push: true
           tags: gravitl/netmaker:${{ env.TAG }}