devops: start Chromium mirroring from GHA (#4492)

.github/workflows/mirror_chromium_to_cdn.yml

@@ -0,0 +1,30 @@
+name: mirror chromium
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/mirror_chromium_to_cdn.yml'
+      - 'browser_patches/chromium/BUILD_NUMBER'
+
+env:
+  AZ_ACCOUNT_KEY: ${{ secrets.AZ_ACCOUNT_KEY }}
+  AZ_ACCOUNT_NAME: ${{ secrets.AZ_ACCOUNT_NAME }}
+  TELEGRAM_BOT_KEY: ${{ secrets.TELEGRAM_BOT_KEY }}
+  DEBIAN_FRONTEND: "noninteractive"
+
+jobs:
+  ubuntu_18_04:
+    name: all platforms
+    runs-on: [ubuntu-18.04]
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: 14
+    - run: ./browser_patches/checkout_build_archive_upload.sh chromium-linux-mirror-to-cdn
+    - run: ./browser_patches/checkout_build_archive_upload.sh chromium-mac-mirror-to-cdn
+    - run: ./browser_patches/checkout_build_archive_upload.sh chromium-win32-mirror-to-cdn
+    - run: ./browser_patches/checkout_build_archive_upload.sh chromium-win64-mirror-to-cdn
+