add ci for integration tests

.github/workflows/ci.yaml

@@ -0,0 +1,36 @@
+name: ci
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+concurrency:
+  # Cancels pending runs when a PR gets updated.
+  group: ${{ github.head_ref || github.run_id }}-${{ github.actor }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    timeout-minutes: 30
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: goto-bus-stop/setup-zig@v2
+        with:
+          version: master
+          cache: false
+
+      - run: zig env
+
+      - name: Run zig fmt
+        run: zig fmt --check .
+
+      - name: Run Tests
+        run: zig build inttest --summary all