Setup github workflow

.github/workflows/main.yml

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+name: Deploy to GitHub Pages
+
+on:
+  # Runs on pushes targeting the default branch
+  push:
+    branches: ['main']
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Sets the GITHUB_TOKEN permissions to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow one concurrent deployment
+concurrency:
+  group: 'pages'
+  cancel-in-progress: true
+
+jobs:
+  # Single deploy job since we're just deploying
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+      - name: yarn install
+        uses: borales/actions-yarn@v4
+        with:
+          cmd: install # will run `yarn install` command
+      - name: Build
+        uses: borales/actions-yarn@v4
+        with:
+          cmd: build
+      - name: Setup CNAME
+        run: echo "tablaster.dev" > dist/CNAME
+      - name: Setup Pages
+        uses: actions/configure-pages@v3
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v1
+        with:
+          # Upload dist repository
+          path: './dist'
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v1