Add preview deployments for PR's

.github/workflows/deploy-website-preview.yml

@@ -0,0 +1,86 @@
+# GitHub Pages preview deployment workflow
+# Builds the Astro website and deploys a preview for pull requests
+
+name: Deploy preview website to GitHub Pages
+
+on:
+  pull_request:
+    branches: [main]
+    paths:
+      - "website/**"
+      - "agents/**"
+      - "skills/**"
+      - "plugins/**"
+      - "instructions/**"
+      - "hooks/**"
+      - "workflows/**"
+      - ".github/workflows/**"
+      - "extensions/**"
+      - "cookbook/**"
+      - "eng/**"
+      - ".all-contributorsrc"
+      - "package.json"
+      - "package-lock.json"
+
+concurrency:
+  group: pages-preview-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  # Build job
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      checks: read
+      contents: read
+      pages: read
+      pull-requests: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+        with:
+          fetch-depth: 0 # Full history needed for git-based last updated dates
+
+      - name: Setup Node.js
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version: "22"
+          cache: "npm"
+
+      - name: Install root dependencies
+        run: npm ci
+
+      - name: Install website dependencies
+        run: npm ci
+        working-directory: ./website
+
+      - name: Build Astro site
+        run: npm run website:build
+
+      - name: Setup Pages
+        if: github.event.pull_request.head.repo.full_name == github.repository # Not a fork
+        uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b # v5.0.0
+
+      - name: Upload artifact
+        if: github.event.pull_request.head.repo.full_name == github.repository # Not a fork
+        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3.0.1
+        with:
+          path: "./website/dist"
+
+  # Deployment job
+  deploy:
+    if: github.event.pull_request.head.repo.full_name == github.repository # Not a fork
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    permissions:
+      pages: write
+      id-token: write
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4.0.5
+        with:
+          preview: true