Test Github action to validate the theme against docsbuild scripts.

.github/workflows/tests.yml

@@ -0,0 +1,34 @@
+name: Tests
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build_doc:
+    name: 'Build cpython doc'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.7
+      - name: clone docsbuild scripts
+        run: |
+          git clone https://github.com/python/docsbuild-scripts/
+      - name: setup requirements
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install jinja2 markupsafe
+      - name: build docs
+        run: |
+          python3 ./docsbuild-scripts/build_docs.py --quick --build-root ./build_root --www-root ./www --log-directory ./logs --group $(id -g) --skip-cache-invalidation --theme $(pwd) --language en --branch 3.9
+      - name: 'Upload'
+        uses: actions/[email protected]
+        with:
+          name: doc-html
+          path: www/