Added GitHub workflow

Author: fkleuver

.github/workflows/ci.yml

@@ -0,0 +1,79 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    name: Test (Node ${{ matrix.node }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node: [18.x, 20.x, 22.x]
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 9
+          run_install: false
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build and test
+        run: pnpm test:spec
+
+  coverage:
+    name: Coverage (domain suite)
+    runs-on: ubuntu-latest
+    needs: test
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 9
+          run_install: false
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20.x
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Run coverage
+        run: |
+          set -o pipefail
+          pnpm test:domain:cov | tee coverage/typecheck/coverage.log
+
+      - name: Coverage summary
+        run: |
+          {
+            echo "## Coverage (domain suite)";
+            echo "";
+            grep -A20 "All files" coverage/typecheck/coverage.log || cat coverage/typecheck/coverage.log;
+          } >> "$GITHUB_STEP_SUMMARY"
+
+      - name: Upload coverage artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-typecheck
+          path: coverage/typecheck