Add workflow config for PR preview to netlify (#8)

.github/workflows/publish.yml

@@ -1,10 +1,10 @@
-name: Build and Deploy GitHub Pages
+name: Build and Deploy Jupyter-Book
 
 on:
   push:
     branches:
       - main
-      - build-jupyterbook
+  pull_request:
   workflow_dispatch:
 
 jobs:
@@ -36,14 +36,20 @@ jobs:
         shell: bash -el {0}
         run: conda run -n bookbuilder jupyter-book build .
       - name: Upload artifact to pass to GitHub Pages
-        if: success() || failure()
+        if: ${{ github.ref == 'refs/heads/main' && (success() || failure()) }}
         uses: actions/upload-pages-artifact@v3
         with:
           path: _build/html
-  deploy:
-    name: Deploy to GitHub Pages
+      - name: Upload artifact to pass to Netlify
+        if: ${{ github.event.pull_request && (success() || failure()) }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: html-preview
+          path: _build/html
+  deploy-main:
+    name: Deploy main branch to GitHub Pages
     needs: build
-    if: success() || failure()
+    if: ${{ github.ref == 'refs/heads/main' && (success() || failure()) }}
     # Grant GITHUB_TOKEN the permissions required to make a Pages deployment
     permissions:
         pages: write      # to deploy to Pages
@@ -58,3 +64,24 @@ jobs:
       - name: Deploy to GitHub Pages
         id: deployment
         uses: actions/deploy-pages@v4
+  deploy-preview:
+    name: Deploy PR preview to Netlify
+    needs: build
+    if: ${{ github.event.pull_request && (success() || failure()) }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: html-preview
+          path: _build/html
+      - name: Deploy to Netlify
+        uses: nwtgck/[email protected]
+        with:
+          publish-dir: _build/html
+          production-deploy: false
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          enable-pull-request-comment: true
+        env:
+          NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
+          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}