add webmention pull to drone

.drone.yml

@@ -2,6 +2,26 @@ kind: pipeline
 name: update_website
 
 steps:
+   - name: fetch_webmentions
+     image: python:3.7
+     when:
+       branch:
+         - main
+     commands:
+      - pip install poetry
+      - cd bstools && poetry install && cd ../
+      - python bstools/bstools.py fetch-mentions --mentions-file ./brainsteam/data/mentions.json
+
+   - name: store_webmentions
+     image: appleboy/drone-git-push
+     settings:
+       remote_name: origin
+       branch: main
+       local_ref: main
+       commit: true
+       commit_message: Commit latest webmentions
+       author_name: DroneCI
+       
    - name: hugo_build
      image: alombarte/hugo
      when: