Add GitHub Pages deployment workflow

- Created GitHub Actions workflow for automated deployment
- Uses pnpm for package management and Node.js 20
- Builds project and deploys to GitHub Pages on main branch push
- Added production base path '/demo-webr-ggplot/' to vite.config.ts
- Site will be available at https://quesmaorg.github.io/demo-webr-ggplot/

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: stared

.github/workflows/deploy.yml

@@ -0,0 +1,56 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'pnpm'
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Build
+        run: pnpm build
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./dist
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

vite.config.ts

@@ -2,6 +2,7 @@ import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'
 
 export default defineConfig({
+  base: process.env.NODE_ENV === 'production' ? '/demo-webr-ggplot/' : '/',
   plugins: [vue()],
   resolve: {
     alias: {