ci: add lint + typecheck GitHub Actions workflow

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+      - run: npm ci
+      - run: npm run lint
+
+  typecheck:
+    name: Typecheck
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+      - run: npm ci
+      - run: npm run generate:importmap
+      - run: npm run typecheck

package.json

@@ -21,7 +21,8 @@
     "start": "cross-env NODE_OPTIONS=--no-deprecation next start",
     "test": "npm run test:int && npm run test:e2e",
     "test:e2e": "cross-env NODE_OPTIONS=\"--no-deprecation --import=tsx/esm\" playwright test --config=playwright.config.ts",
-    "test:int": "cross-env NODE_OPTIONS=--no-deprecation vitest run --config ./vitest.config.mts"
+    "test:int": "cross-env NODE_OPTIONS=--no-deprecation vitest run --config ./vitest.config.mts",
+    "typecheck": "tsc --noEmit"
   },
   "dependencies": {
     "@payloadcms/admin-bar": "3.76.1",