ci: restructure build pipeline for dual deployment

.github/workflows/deploy.yaml

@@ -1,11 +1,9 @@
 name: Deploy to GitHub Pages
 
 on:
-  # Trigger the workflow every time you push to the `main` branch
-  # Using a different branch name? Replace `main` with your branch’s name
   push:
     branches: [main]
-  # Allows you to run this workflow manually from the Actions tab on GitHub.
+  pull_request:
   workflow_dispatch:
 
 # Allow this job to clone the repo and create a page deployment
@@ -23,15 +21,27 @@ jobs:
       - name: Install D2 diagramming tool
         run: |
           curl -fsSL https://d2lang.com/install.sh | sh -s --
-      - name: Install, build, and upload your site
-        uses: withastro/action@v4
-        # with:
-        # path: . # The root location of your Astro project inside the repository. (optional)
-        # node-version: 20 # The specific version of Node that should be used to build your site. Defaults to 20. (optional)
-        # package-manager: pnpm@latest # The Node package manager that should be used to install dependencies and build your site. Automatically detected based on your lockfile. (optional)
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          enable-corepack: true
+      - name: Install dependencies
+        run: pnpm install
+      - name: Build site
+        run: pnpm run build
+      - name: Upload GitHub Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: dist/
+      - name: Upload dist artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: dist/
 
   deploy:
     needs: build
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
     environment:
       name: github-pages