chore: migrate CI to GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,53 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+    branches:
+      - main
+      - "release/*"
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - windows-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Use Node.js 24.18.0
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24.18.0
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run hygiene checks
+        run: |
+          npm run check:isolated-lockfiles
+          npm run lint
+
+      - name: Compile
+        run: npm run compile
+
+      - name: Run unit tests
+        run: npm run test
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results-${{ matrix.os }}
+          path: util/junit.xml
+          if-no-files-found: ignore