docs workflow

.github/workflows/docs.yml

@@ -0,0 +1,22 @@
+name: Docs
+on:
+  push:
+    branches:
+      - gh-pages
+  pull_request:
+    branches:
+      - gh-pages
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.9
+      - name: Install dependencies
+        run: python -m pip install --upgrade pip sphinx
+      - name: Build docs
+        run: sphinx-build source docs