add GitHub Pages workflow

Author: Vonng

.github/workflows/page.yaml

@@ -0,0 +1,84 @@
+# Build and validate the PIG documentation site, then deploy it to GitHub Pages.
+name: Build and Deploy PIG Docs
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages-${{ github.ref }}
+  cancel-in-progress: false
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      HUGO_VERSION: 0.164.0
+    steps:
+      - name: Install Hugo CLI
+        run: |
+          wget -O ${{ runner.temp }}/hugo.deb https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/hugo_extended_${HUGO_VERSION}_linux-amd64.deb \
+          && sudo dpkg -i ${{ runner.temp }}/hugo.deb
+
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Setup Pages
+        id: pages
+        uses: actions/configure-pages@v5
+
+      - name: Check site
+        env:
+          HUGO_CACHEDIR: ${{ runner.temp }}/hugo_cache
+          HUGO_ENVIRONMENT: production
+          HUGO_ENV: production
+        run: make check
+
+      - name: Build for GitHub Pages
+        env:
+          HUGO_CACHEDIR: ${{ runner.temp }}/hugo_cache
+          HUGO_ENVIRONMENT: production
+          HUGO_ENV: production
+        run: |
+          hugo \
+            --minify \
+            --cleanDestinationDir \
+            --baseURL "${{ steps.pages.outputs.base_url }}/"
+
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./public
+
+  deploy:
+    if: github.event_name != 'pull_request'
+    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@v5