ci: add eslint and typescript type-check workflow

.github/workflows/lint.yml

@@ -0,0 +1,52 @@
+name: Lint & Type Check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: lint-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    name: ESLint & TypeScript
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        shell: bash
+        run: echo "STORE_PATH=$(pnpm store path)" >> "$GITHUB_OUTPUT"
+
+      - name: Cache pnpm dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
+          key: pnpm-store-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}
+          restore-keys: |
+            pnpm-store-${{ runner.os }}-
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Run ESLint
+        run: pnpm lint
+
+      - name: Run TypeScript type check
+        run: pnpm type-check