Add docs build CLI (#178)

.github/workflows/tests.yml

@@ -53,6 +53,29 @@ jobs:
         file: ./coverage.xml
         fail_ci_if_error: true
 
+
+  docs:
+
+    name: Test documentation build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e .[rtd]
+
+      # Build the docs
+      - name: Build docs to store
+        run: |
+          cd docs
+          make html-strict
+
+
   publish:
 
     name: Publish to PyPi