ci: avoid slow Ubuntu mirrors during WebKit setup (#32205)

* ci: reuse bounded Ubuntu mirror setup for WebKit

* ci: preserve Ubuntu setup for dispatched older refs

.github/scripts/prepare-ubuntu-apt.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# GitHub's mirror+file sources resolve through apt-mirrors.txt, not just sources.list.
+for source in /etc/apt/apt-mirrors.txt /etc/apt/sources.list /etc/apt/sources.list.d/*.list /etc/apt/sources.list.d/*.sources; do
+  if [ -f "$source" ]; then
+    sudo sed -i 's|https*://azure\.archive\.ubuntu\.com/ubuntu|https://archive.ubuntu.com/ubuntu|g' "$source"
+  fi
+done
+sudo tee /etc/apt/apt.conf.d/99-orca-ci >/dev/null <<'APTCONF'
+Acquire::http::Timeout "15";
+Acquire::https::Timeout "15";
+Acquire::Retries "1";
+APTCONF

.github/workflows/e2e.yml

@@ -88,17 +88,21 @@ jobs:
             exit 0
           fi
           read -r -a packages <<< "$ORCA_E2E_APT_PACKAGES"
-          # Why apt-mirrors.txt: runner images resolve mirror+file: sources through it, so editing the lists alone leaves Azure in use.
-          for source in /etc/apt/apt-mirrors.txt /etc/apt/sources.list /etc/apt/sources.list.d/*.list /etc/apt/sources.list.d/*.sources; do
-            if [ -f "$source" ]; then
-              sudo sed -i 's|https*://azure\.archive\.ubuntu\.com/ubuntu|https://archive.ubuntu.com/ubuntu|g' "$source"
-            fi
-          done
-          sudo tee /etc/apt/apt.conf.d/99-orca-e2e >/dev/null <<'APTCONF'
+          if [ -f .github/scripts/prepare-ubuntu-apt.sh ]; then
+            bash .github/scripts/prepare-ubuntu-apt.sh
+          else
+            # Dispatched refs can predate the shared preparation script.
+            for source in /etc/apt/apt-mirrors.txt /etc/apt/sources.list /etc/apt/sources.list.d/*.list /etc/apt/sources.list.d/*.sources; do
+              if [ -f "$source" ]; then
+                sudo sed -i 's|https*://azure\.archive\.ubuntu\.com/ubuntu|https://archive.ubuntu.com/ubuntu|g' "$source"
+              fi
+            done
+            sudo tee /etc/apt/apt.conf.d/99-orca-ci >/dev/null <<'APTCONF'
           Acquire::http::Timeout "15";
           Acquire::https::Timeout "15";
           Acquire::Retries "1";
           APTCONF
+          fi
           timeout 120 sudo apt-get update
           timeout 300 sudo apt-get install -y "${packages[@]}" || timeout 300 sudo apt-get install -y --fix-missing "${packages[@]}"
 

.github/workflows/pr.yml

@@ -939,7 +939,9 @@ jobs:
       - name: Install WebKit for the drawer check
         id: webkit
         background: true
-        run: pnpm exec playwright-core install --with-deps webkit
+        run: |
+          bash .github/scripts/prepare-ubuntu-apt.sh
+          pnpm exec playwright-core install --with-deps webkit
 
       # The entry lives in mobile/ so one React resolves; without this every RN import is nothing.
       - uses: ./.github/actions/install-mobile-dependencies

config/scripts/pr-code-change-scope.mjs

@@ -173,6 +173,7 @@ const DEPENDENCY_ISOLATION_PREFIXES = [
 ]
 
 const MOBILE_WEB_APP_PREFIXES = [
+  '.github/scripts/prepare-ubuntu-apt.sh',
   'config/scripts/build-mobile-web-app',
   'config/scripts/run-mobile-web-app-checks',
   'src/packages/process-host/',

config/scripts/pr-e2e-source-routing.mjs

@@ -520,6 +520,7 @@ export function selectPrE2eSpecs(
         (file.startsWith('tests/e2e/helpers/') &&
           [...specs].some((spec) => spec.startsWith(MANAGED_SSH_E2E_SPEC_PREFIX))) ||
         file === '.github/workflows/e2e.yml' ||
+        file === '.github/scripts/prepare-ubuntu-apt.sh' ||
         file === 'config/scripts/ci-e2e-job-selection.mjs'
     )
   ) {

config/scripts/pr-layout-oracle-route.mjs

@@ -62,6 +62,7 @@ const LAYOUT_ORACLE_PREFIXES = [
   '.github/scripts/e2e-with-window-manager.sh',
   // The job itself: the called workflow, its window-spec lane picker, and this route.
   '.github/workflows/e2e.yml',
+  '.github/scripts/prepare-ubuntu-apt.sh',
   'config/scripts/ci-e2e-job-selection.mjs',
   'config/scripts/pr-layout-oracle-route.mjs'
 ]