add ci

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily

.github/workflows/ci.yml

@@ -0,0 +1,42 @@
+name: ci
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  test:
+    name: test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up zig
+        uses: goto-bus-stop/setup-zig@v2
+        with:
+          version: 0.11.0
+
+      - name: Run tests
+        run: zig build test
+
+  format:
+    name: format
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up zig
+        uses: goto-bus-stop/setup-zig@v2
+        with:
+          version: 0.11.0
+
+      - name: Check formatting
+        run: zig fmt --check .