Build and deploy site as part of CI

.github/workflows/test-and-deploy.yml

@@ -0,0 +1,52 @@
+
+name: Test and deploy
+
+on:
+  push:
+    branches:
+      - main
+
+  pull_request:
+    branches:
+      - main
+
+# see https://github.com/peaceiris/actions-gh-pages#%EF%B8%8F-gatsby
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Setup Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: "16"
+
+      # deps
+      #- run: sudo yarn global add <pkg>@^<version> --prefix /usr/local
+      #- run: yarn add <pkg>@^<version>
+
+      # install deps
+      - run: yarn install
+
+      - name: Cache dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+
+      #- run: npm ci
+      - run: npm run build
+      - name: Deploy
+        if: github.ref == 'refs/heads/main'
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          # see https://docs.github.com/en/free-pro-team@latest/actions/reference/authentication-in-a-workflow#about-the-github_token-secret
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./dist
+          user_name: 'github-actions[bot]'
+          user_email: 'github-actions[bot]@users.noreply.github.com'
+          commit_message: ${{ github.event.head_commit.message }}
+