Add deployment workflow

.github/workflows/github-pages.yaml

@@ -0,0 +1,39 @@
+name: Github Pages
+
+on:
+  push:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: "Checkout Repository"
+        uses: actions/checkout@v2
+        with:
+          submodules: true
+      - name: "Set up Hugo"
+        uses: peaceiris/actions-hugo@v2
+        with:
+          hugo-version: latest
+      - name: "Build"
+        run: hugo --minify -e production
+      - name: "Upload pages artifact"
+        uses: actions/upload-pages-artifact@v2
+        with:
+          path: public
+  deploy:
+    runs-on: ubuntu-latest
+    needs: build
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: "Deploy"
+        uses: actions/deploy-pages@v2