ci(docs): Deploy docs for changes in develop

.gitlab-ci.yml

@@ -327,8 +327,13 @@ build_documentation:
   artifacts:
     paths:
       - public
-  only:
-    - stable@funkwhale/funkwhale
+  rules:
+    - if: $CI_COMMIT_BRANCH == "stable"
+      when: always
+    - if: $CI_COMMIT_BRANCH == "develop"
+      changes:
+        - docs/**/*
+      when: always
   tags:
     - docker