add workflow for building project and docs on pull request

.github/workflows/build.yml

@@ -0,0 +1,29 @@
+name: Build project and docs
+
+on:
+  pull_request:
+    types: [opened, reopened]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+      - name: Install dependencies
+        run: npm ci        
+      - name: Build Vue.js app
+        run: npm run build
+      - name: Build VitePress docs
+        run: |
+          npm run docs:build
+          mv ./docs/.vitepress/dist ./dist/docs