docs: add a flow to build the site and publish to GitHub Pages (#182)

Author: ibodrov

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

@@ -0,0 +1,55 @@
+name: Build and Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+
+      - name: Build Docker image
+        run: docker build -t concord-website-builder:latest .
+
+      - name: Run Jekyll build
+        run: |
+          docker run --rm \
+            --user "$(id -u):$(id -g)" \
+            --volume "$PWD:/build/repo" \
+            --entrypoint bundle \
+            concord-website-builder:latest \
+            exec jekyll build --source /build/repo --destination /build/repo/_site
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./_site
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    if: github.ref == 'refs/heads/master'
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4