devops: add workflow triggering internal tests (#915)

.github/workflows/trigger_internal_tests.yml

@@ -0,0 +1,21 @@
+name: "Internal Tests"
+
+on:
+  push:
+    branches:
+      - main
+      - release-*
+
+jobs:
+  trigger:
+    name: "trigger"
+    runs-on: ubuntu-20.04
+    steps:
+    - run: |
+        curl -X POST \
+          -H "Accept: application/vnd.github.v3+json" \
+          -H "Authorization: token ${GH_TOKEN}" \
+          --data "{\"event_type\": \"playwright_tests_java\", \"client_payload\": {\"ref\": \"${GITHUB_SHA}\"}}" \
+          https://api.github.com/repos/microsoft/playwright-internal/dispatches
+      env:
+        GH_TOKEN: ${{ secrets.REPOSITORY_DISPATCH_PERSONAL_ACCESS_TOKEN }}