Issue #194: Check that docs build on PR

.github/workflows/commit_checks.yml

@@ -40,3 +40,24 @@ jobs:
           excludeTitle: 'true'
           checkAllCommitMessages: 'true'
           accessToken: ${{ secrets.GITHUB_TOKEN }}
+  check-doc-build:
+    name: Test Documentation Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: pandoc/actions/setup@main
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v3
+        with:
+            python-version: '3.10'     
+      - name: Mock Basilisk
+        run: |
+          cp docs/sitecustomize.py $(python -c 'import site; print(site.getsitepackages()[0])')/sitecustomize.py
+      - name: Install dependencies
+        run: |
+          pip install -e '.[docs,rllib]'
+        # skip finish install steps
+      - name: Sphinx build
+        run: |
+          cd docs
+          make html
+          cd ..