ci(github-actions): update deployment workflow

- Rename workflow to "Deploy to GitHub Pages"
- Add push trigger for main branch
- Split workflow into build and deployment jobs
- Add staging deployment for pushes to main
- Retain production deployment for releases

Author: fulleni

.github/workflows/deploy.yml

@@ -1,18 +1,15 @@
-name: Deploy to GitHub Pages on Release
+name: Deploy to GitHub Pages
 
 on:
+  push:
+    branches:
+      - main
   release:
     types: [published]
 
-permissions:
-  contents: read
-  pages: write
-  id-token: write
-
 jobs:
-  deploy:
+  build:
     runs-on: ubuntu-latest
-    
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -29,14 +26,37 @@ jobs:
       - name: Build
         run: npm run build
 
-      - name: Setup Pages
-        uses: actions/configure-pages@v5
-
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with:
           path: ./dist
 
+  deploy-staging:
+    needs: build
+    if: github.event_name == 'push'
+    runs-on: ubuntu-latest
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4
+
+  deploy-production:
+    needs: build
+    if: github.event_name == 'release'
+    runs-on: ubuntu-latest
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
       - name: Deploy to GitHub Pages
         id: deployment
         uses: actions/deploy-pages@v4