add doc workflow

.github/workflows/documentation.yml

@@ -0,0 +1,32 @@
+# Build documentation
+name: documentation
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  documentation:
+    runs-on: ubuntu-latest
+    name: Build documentation
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.10"
+
+      - name: Install poetry
+        run: |
+          python -m pip install --upgrade pip
+          pip install poetry
+
+      - name: Install package
+        run: poetry install
+
+      - name: Build documentation
+        run: poetry run make html --directory docs/