CI: build driver once on Linux, share bundles as an artifact

The per-job source build can't run on Windows (Git Bash lacks zip/unzip and
the heavy upstream monorepo build is not exercised there), and rebuilding the
fully cross-platform driver in every wheel job is redundant and slow.

Add a single 'build-driver' job that builds all six platform bundles on Linux
and uploads them as a workflow artifact. Every wheel-building job (Lint, Build,
Stable, Conda) now downloads that artifact into driver/ so setup.py's
ensure_driver_bundle early-returns and embeds the prebuilt zip -- no Node, bash
or zip/unzip needed on Windows/macOS. A verify step asserts all six bundles are
present before building.

Docker and Azure publish are unchanged: they run on Linux and build the driver
once on their own host, which already works.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Skn0tt

.github/workflows/ci.yml

@@ -17,19 +17,43 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  build-driver:
+    name: Build driver
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+    - uses: actions/checkout@v6
+    - name: Set up Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '24'
+    - name: Build driver bundles from source
+      run: bash scripts/build_driver.sh
+    - name: Upload driver bundles
+      uses: actions/upload-artifact@v4
+      with:
+        name: driver-bundles
+        path: driver/playwright-*.zip
+        if-no-files-found: error
+        # The bundles are already-compressed zips; skip re-compression.
+        compression-level: 0
+        retention-days: 1
+
   infra:
     name: Lint
+    needs: build-driver
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v6
     - name: Set up Python
       uses: actions/setup-python@v6
       with:
         python-version: "3.10"
-    - name: Set up Node.js
-      uses: actions/setup-node@v4
+    - name: Download driver bundles
+      uses: actions/download-artifact@v4
       with:
-        node-version: '24'
+        name: driver-bundles
+        path: driver/
     - name: Install dependencies & browsers
       run: |
         python -m pip install --upgrade pip
@@ -47,6 +71,7 @@ jobs:
 
   build:
     name: Build
+    needs: build-driver
     timeout-minutes: 45
     strategy:
       fail-fast: false
@@ -100,10 +125,11 @@ jobs:
       uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
-    - name: Set up Node.js
-      uses: actions/setup-node@v4
+    - name: Download driver bundles
+      uses: actions/download-artifact@v4
       with:
-        node-version: '24'
+        name: driver-bundles
+        path: driver/
     - name: Install dependencies & browsers
       run: |
         python -m pip install --upgrade pip
@@ -133,6 +159,7 @@ jobs:
 
   test-stable:
     name: Stable
+    needs: build-driver
     timeout-minutes: 45
     strategy:
       fail-fast: false
@@ -151,10 +178,11 @@ jobs:
       uses: actions/setup-python@v6
       with:
         python-version: "3.10"
-    - name: Set up Node.js
-      uses: actions/setup-node@v4
+    - name: Download driver bundles
+      uses: actions/download-artifact@v4
       with:
-        node-version: '24'
+        name: driver-bundles
+        path: driver/
     - name: Install dependencies & browsers
       run: |
         python -m pip install --upgrade pip