Persist artifacts to workspace

Author: melissawm

.circleci/config.yml

@@ -54,6 +54,12 @@ jobs:
           command: |
             . venv/bin/activate
             xvfb-run --auto-servernum make docs-build GALLERY_PATH=../napari/examples/
+      - store_artifacts:
+          path: docs/_build/
+      - persist_to_workspace:
+          root: .
+          paths:
+            - docs/_build/
 
 # Invoke jobs via workflows
 # See: https://circleci.com/docs/2.0/configuration-reference/#workflows