Add PR validation workflow

Author: jamesmcroft

.github/workflows/pr-validation.yml

@@ -0,0 +1,23 @@
+name: Pull Request Validation
+
+on:
+  pull_request:
+    branches: ["main"]
+
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+      - name: Install dependencies
+        run: npm install
+      - name: Build with React
+        run: npm run build