add github workflow to build docs

Author: thrau

Diff for: .github/workflows/github-pages.yml

@@ -0,0 +1,37 @@
+# adapted from https://github.com/peaceiris/actions-gh-pages
+
+name: github pages
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Hugo
+        uses: peaceiris/actions-hugo@v2
+        with:
+          hugo-version: '0.83.1'
+          extended: true
+
+      - name: Setup Node
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+
+      - run: npm ci
+      - run: hugo --gc --minify
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        if: github.ref == 'refs/heads/main'
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./public
+          cname: localstack.cloud