feat(workflow): add job close-pr in pull.yml

.github/workflows/pull.yml

@@ -1,6 +1,33 @@
 name: PullLint
 on: [ pull_request ]
 jobs:
+  # This workflow closes invalid PR
+  close-pr:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+
+      - name: Setup GitHub CLI
+        uses: cli/cli@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      # Runs a single command using the runners shell
+      - name: Get PR commit message
+        id: pr
+        run: echo "::set-output name=message::$(git log --format=%B -n 1)"
+
+      # Runs a set of commands using the runners shell
+      - name: Close PR if commit message is "Update main.go"
+        if: steps.pr.outputs.message == 'Update main.go'
+        run: |
+          echo "Closing this PR because commit message is 'Update main.go'"
+          gh pr close ${{ github.event.pull_request.number }} --delete-branch
+
   golangci:
     name: lint
     runs-on: ubuntu-latest