ci: use pnpm

.github/workflows/ci.yaml

@@ -0,0 +1,33 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          cache: pnpm
+
+      - name: Install ni
+        run: npm i -g @antfu/ni
+
+      - name: Install dependencies
+        id: dependencies
+        run: nci
+
+      - name: Lint
+        if: steps.dependencies.outcome == 'success'
+        run: nr lint