devops: try building webkit on a self-hosted ubuntu 18.04 runner (#4473)

.github/workflows/build_webkit.yml

@@ -0,0 +1,27 @@
+name: build webkit
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/build_webkit.yml'
+      - 'browser_patches/webkit/BUILD_NUMBER'
+
+env:
+  AZ_ACCOUNT_KEY: ${{ secrets.AZ_ACCOUNT_KEY }}
+  AZ_ACCOUNT_NAME: ${{ secrets.AZ_ACCOUNT_NAME }}
+  TELEGRAM_BOT_KEY: ${{ secrets.TELEGRAM_BOT_KEY }}
+
+jobs:
+  ubuntu_18_04:
+    name: Ubuntu 18.04
+    runs-on: playwright-ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: 14
+    - uses: microsoft/playwright-github-action@v1
+    - run: ./browser_patches/checkout_build_archive_upload.sh webkit-ubuntu-18.04
+