actions: add notify-on-push action (#256)

Signed-off-by: flakey5 <[email protected]>

Author: flakey5

.github/workflows/notify-on-force-push.yml

@@ -0,0 +1,30 @@
+name: Notify on Push
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  notify-on-push:
+    name: Notify on any direct push to `main`
+    if: >
+      github.repository == 'nodejs/release-cloudflare-worker' && 
+      github.actor != 'github-merge-queue[bot]'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Slack Notification
+        uses: rtCamp/action-slack-notify@c33737706dea87cd7784c687dadc9adf1be59990 # 2.3.2
+        env:
+          SLACK_COLOR: '#DE512A'
+          SLACK_ICON: https://github.com/nodejs.png?size=48
+          SLACK_TITLE: ${{ github.actor }} directly pushed to ${{ github.ref }}
+          SLACK_MESSAGE: |
+            A commit was directly pushed to <https://github.com/${{ github.repository }}/tree/${{ github.ref_name }}|${{ github.repository }}@${{ github.ref_name }}> by <https://github.com/${{ github.actor }}|${{ github.actor }}>
+
+            Before: <https://github.com/${{ github.repository }}/commit/${{ github.event.before }}|${{ github.event.before }}>
+            After: <https://github.com/${{ github.repository }}/commit/${{ github.event.after }}|${{ github.event.after }}>
+          SLACK_USERNAME: nodejs-bot
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}