ci: run pnpm ci in GitHub Actions (#16)

* ci: run pnpm ci in GitHub Actions

* ci: pin pnpm version in workflow

* ci: use ci:check script in workflow

* ci: run PR checks on head sha

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Run CI checks
+        run: pnpm run ci:check

package.json

@@ -19,7 +19,7 @@
     "db:migrate:local": "wrangler d1 migrations apply DB --local",
     "db:migrate:prod": "wrangler d1 migrations apply DB --remote",
     "knip": "knip",
-    "ci": "prettier --check . && knip && tsc --noEmit && oxlint . --type-aware"
+    "ci:check": "prettier --check . && knip && tsc --noEmit && oxlint . --type-aware"
   },
   "cloudflare": {
     "bindings": {