CI: Test build on Pull Request (#83)

* Created test build for PRs
* Specify node version for Vercel adapter
* Added SANITY_ID secret

.github/workflows/test-build-on-PR.yml

@@ -0,0 +1,32 @@
+name: Test Build on Pull Request
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test-build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: '24.x'
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - name: Install dependencies
+        run: bun install
+
+      - name: Build the website
+        run: bun run build
+        env:
+          SANITY_ID: ${{ secrets.SANITY_ID }}