add pull request check workflow

.gitea/workflows/pr.yml

@@ -0,0 +1,28 @@
+name: Pull Request Check
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+    - name: 🏗 Setup repo
+      uses: actions/checkout@v2
+
+    - name: 🏗 Setup Node
+      uses: actions/setup-node@v2
+      with:
+        node-version: 22
+
+    - name: 🏗 Setup pnpm
+      uses: pnpm/action-setup@v4
+      with:
+        version: latest
+
+    - name: 📦 Install dependencies
+      run: pnpm install
+
+    - name: 🧪 Check for linting/type errors
+      run: npx expo export --platform web