Migrate from Appveyor to GitHub Actions Windows runners

Author: canova

.github/workflows/ci.yml

@@ -22,7 +22,10 @@ jobs:
         run: yarn lint
 
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
     steps:
       - name: Checkout code
         uses: actions/checkout@v5
@@ -36,12 +39,16 @@ jobs:
         run: yarn test --coverage --logHeapUsage -w=4 --workerIdleMemoryLimit=1.5G
 
       - name: Upload coverage to Codecov
+        if: matrix.os == 'ubuntu-latest'
         uses: codecov/codecov-action@v5
         with:
           fail_ci_if_error: false
 
   build-prod:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
     steps:
       - name: Checkout code
         uses: actions/checkout@v5