always run build_docs in CI (#4053)

.circleci/config.yml

@@ -1432,7 +1432,7 @@ workflows:
           filters:
             branches:
               only:
-              - nightly
+              - '*'
             tags:
               only: /v[0-9]+(\.[0-9]+)*-rc[0-9]+/
           name: build_docs

.circleci/regenerate.py

@@ -57,7 +57,7 @@ def build_workflows(prefix='', filter_branch=None, upload=False, indentation=6,
 
     if not filter_branch:
         # Build on every pull request, but upload only on nightly and tags
-        w += build_doc_job('nightly')
+        w += build_doc_job('*')
         w += upload_doc_job('nightly')
     return indent(indentation, w)