add github pages workflow

Author: ueokande

.github/workflows/gh-pages.yml

@@ -0,0 +1,48 @@
+name: Deploy GitHub Pages
+
+on:
+  push:
+    branches:
+      - master
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v3
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'pnpm'
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+        with:
+          static_site_generator: gatsby
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+      - name: Lint
+        run: pnpm run lint
+      - name: Build
+        run: pnpm run build
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./public
+
+  deploy:
+    needs: build
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4