ci: add manual dispatch GitHub Actions workflow

- Deploy static files to GitHub Pages
- Manual trigger only (workflow_dispatch)
- No build step needed (buildless)
- Save GitHub Actions minutes
- Proper permissions for Pages deployment

Usage:
1. Go to Actions tab
2. Select 'Deploy to GitHub Pages'
3. Click 'Run workflow'
4. Deploy manually when ready

Author: sandikodev

.github/workflows/deploy.yml

@@ -0,0 +1,36 @@
+name: Deploy to GitHub Pages
+
+on:
+  workflow_dispatch:  # Manual trigger only
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+      
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: '.'
+      
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4