Add python workflow for docs

.github/workflows/build_docs.yml

@@ -0,0 +1,32 @@
+name: Test docs
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10"]
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install pip
+      run: |
+        python -m pip install --upgrade pip
+    - name: Install requirements
+      run: |
+        python -m pip install -r docs/requirements.txt
+    - name: Test docs
+      run: |
+        cd ./docs && make html -d