Add Windows CI (#14065)

This PR changes the GitHub action workflow for V4 to start running all
unit tests and build on both Ubuntu (our current default) _and_ Windows.
This is to ensure we catch issues with paths and other Windows-specific
things sooner. It does, however, not replace testing on Windows.

.github/workflows/ci.yml

@@ -11,12 +11,14 @@ permissions:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
-    timeout-minutes: 15
-
     strategy:
+      fail-fast: false
       matrix:
         node-version: [20]
+        runner: [ubuntu-latest, windows-latest]
+
+    runs-on: ${{ matrix.runner }}
+    timeout-minutes: 15
 
     steps:
       - uses: actions/checkout@v3
@@ -61,6 +63,8 @@ jobs:
 
       - name: Lint
         run: pnpm run lint
+        # Only lint on linux to avoind \r\n line ending errors
+        if: matrix.runner == 'ubuntu-latest'
 
       - name: Test
         run: pnpm run test