Add lint and format CI (#13)

Author: hirbod

.github/workflows/checks.yml

@@ -0,0 +1,36 @@
+name: Checks
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  lint-format:
+    name: Lint and format
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Setup Node
+        uses: actions/setup-node@v6
+        with:
+          node-version: 24
+
+      - name: Enable Corepack
+        run: corepack enable
+
+      - name: Install dependencies
+        run: yarn install --immutable
+
+      - name: Lint
+        run: yarn lint
+
+      - name: Check formatting
+        run: yarn format:check