use github-pr-check for pull requests

Author: haya14busa

.github/workflows/reviewdog.yml

@@ -12,6 +12,14 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: reviewdog/action-vint@v1
+        if: github.event_name == 'pull_request'
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-pr-check
+          level: warning
+      - uses: reviewdog/action-vint@v1
+        if: github.event_name != 'pull_request'
         with:
           github_token: ${{ secrets.github_token }}
           reporter: github-check
+          level: warning