feat: add GitHub Actions workflow for deployment to GitHub Pages

.github/workflows/deploy.yml

@@ -0,0 +1,49 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: 'main'
+
+jobs:
+  build_site:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: build
+        env:
+          BASE_PATH: '/${{ github.event.repository.name }}'
+        run: |
+          npm run build
+
+      - name: Upload Artifacts
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: 'build/'
+
+  deploy:
+    needs: build_site
+    runs-on: ubuntu-latest
+
+    permissions:
+      pages: write
+      id-token: write
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - name: Deploy
+        id: deployment
+        uses: actions/deploy-pages@v4

svelte.config.js

@@ -18,6 +18,9 @@ const config = {
 		serviceWorker: { register: false },
 		alias: {
 			$routes: './src/routes'
+		},
+		paths: {
+			base: process.argv.includes('dev') ? '' : process.env.BASE_PATH
 		}
 	}
 };