Create push-master.yml

.github/workflows/push-master.yml

@@ -0,0 +1,18 @@
+name: 'Push `master`'
+on:
+  pull_request:
+    branches: ['master']
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v3
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            await github.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: `⚠⚠⚠ Hey @${context.actor}, did you mean to open this against \`next\`? ⚠⚠⚠`
+            })