Fixes apache#5500 - Add a Github Actions workflow that builds the docs

Signed-off-by: Martin Tzvetanov Grigorov <mgrigorov@apache.org>

.asf.yaml

@@ -39,3 +39,7 @@ github:
     rebase: false    
   features:
     issues: true        
+
+publish:
+  whoami: asf-site
+  subdir: datafusion

.github/workflows/docs.yaml

@@ -0,0 +1,60 @@
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - .github/workflows/docs.yaml
+      - docs/**
+
+name: Deploy DataFusion site
+
+jobs:
+  build-docs:
+    name: Build docs
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout docs sources
+        uses: actions/checkout@v3
+
+      - name: Checkout asf-site branch
+        uses: actions/checkout@v3
+        with:
+          ref: asf-site
+          path: asf-site
+
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.10"
+
+      - name: Install dependencies
+        run: |
+          set -x
+          python3 -m venv venv
+          source venv/bin/activate
+          pip install -r docs/requirements.txt
+
+      - name: Build docs
+        run: |
+          set -x
+          source venv/bin/activate
+          cd docs
+          ./build.sh
+
+      - name: Copy & push the generated HTML
+        run: |
+          set -x
+          cd asf-site/
+          # delete anything but: 1) '.'; 2) '..'; 3) .git/
+          rm -rf .github .buildinfo .gitattributes .github_changelog_generator .gitignore .gitmodules
+          find ./ | grep -vE "^./$|^../$|^./.git" | xargs rm -rf
+          cp ../.asf.yaml .
+          cp -rT ../docs/build/html/ .
+          git status --porcelain
+          if [ "$(git status --porcelain)" != "" ]; then
+            git config user.name "github-actions[bot]"
+            git config user.email "github-actions[bot]@users.noreply.github.com"
+            git add --all
+            git commit -m 'Publish built docs triggered by ${{ github.sha }}'
+            git push || git push --force
+          fi

docs/source/_templates/docs-sidebar.html

@@ -1,7 +1,4 @@
 
-<a class="navbar-brand" href="{{ pathto(master_doc) }}">
-  <img src="{{ pathto('_static/images/' + logo, 1) }}" class="logo" alt="logo">
-</a>
 
 <form class="bd-search d-flex align-items-center" action="{{ pathto('search') }}" method="get">
   <i class="icon fas fa-search"></i>