devops: add workflow to trigger chromium tip-of-tree builds (#13668)

.github/workflows/trigger_build_chromium_tip_of_tree.yml

@@ -0,0 +1,31 @@
+name: "Trigger: Chromium Tip Of Tree Builds"
+
+on:
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: 'Playwright SHA / ref to build Chromium Tip Of Tree'
+        required: true
+        default: 'main'
+  push:
+    branches:
+      - main
+      - release-*
+    paths:
+      - browser_patches/chromium/BUILD_NUMBER
+      - .github/workflows/trigger_build_chromium_tip_of_tree.yml
+
+jobs:
+  trigger:
+    name: "trigger"
+    runs-on: ubuntu-20.04
+    steps:
+    - run: |
+        curl -X POST \
+          -H "Accept: application/vnd.github.v3+json" \
+          -H "Authorization: token ${GH_TOKEN}" \
+          --data "{\"event_type\": \"build_chromium_tip_of_tree\", \"client_payload\": {\"ref\": \"${GHREF}\"}}" \
+          https://api.github.com/repos/microsoft/playwright-internal/dispatches
+      env:
+        GH_TOKEN: ${{ secrets.REPOSITORY_DISPATCH_PERSONAL_ACCESS_TOKEN }}
+        GHREF: ${{ github.event_name == 'workflow_dispatch' &&  github.event.inputs.ref || github.sha  }}