Add CI workflow for automated build and test on alpha branch

.github/workflows/ci.yml

@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  push:
+    branches: ["alpha"]
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  build:
+    name: Build and Test
+    timeout-minutes: 15
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Cache turbo build setup
+        uses: actions/cache@v4
+        with:
+          path: .turbo
+          key: ${{ runner.os }}-turbo-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-turbo-
+
+      - name: Setup Node.js environment
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Build
+        run: npm run build
+
+      - name: Test
+        run: npm run test

turbo.json

@@ -5,7 +5,7 @@
 	"tasks": {
 		"build": {
 			"dependsOn": ["^build"],
-			"outputs": ["dist/**"]
+			"outputs": ["dist/**", ".next/**", "!.next/cache/**"]
 		},
 		"dev": {
 			"cache": false,