feat(ci): add build docs step

.github/workflows/python-ci.yml

@@ -5,7 +5,6 @@ on:
     branches:
       - main
     paths-ignore:
-      - "**.rst"
       - "**.md"
   pull_request:
     branches:
@@ -38,6 +37,20 @@ jobs:
         run: |
           poetry install
 
+      - name: Get all doc files that have changed
+        id: changed_docs
+        uses: tj-actions/changed-files@v37
+        with:
+          files: |
+            docs
+
+      - name: Build docs
+        if: steps.changed_docs.outputs.modified_files == 'true'
+        working-directory: docs
+        run: |
+          poetry run pip install -r requirements.txt
+          poetry run make html
+
       - name: Lint with flake8
         if: startsWith(matrix.os, 'ubuntu')
         run: |