fix tag build so it triggers prerequisites

.circleci/config.yml

@@ -619,6 +619,11 @@ workflows:
           name: binary_linux_wheel_py3.7
           python_version: '3.7'
       - binary_linux_wheel:
+          filters:
+            branches:
+              only: /.*/
+            tags:
+              only: /v[0-9]+(\.[0-9]+)*-rc[0-9]+/
           name: binary_linux_wheel_py3.8
           python_version: '3.8'
       - binary_linux_wheel:
@@ -685,6 +690,11 @@ workflows:
           name: binary_windows_conda_py3.9
           python_version: '3.9'
       - build_docs:
+          filters:
+            branches:
+              only: /.*/
+            tags:
+              only: /v[0-9]+(\.[0-9]+)*-rc[0-9]+/
           name: build_docs
           python_version: '3.8'
           requires:

.circleci/regenerate.py

@@ -30,11 +30,17 @@ def build_workflows(prefix='', upload=False, filter_branch=None, indentation=6):
     for btype in ["wheel", "conda"]:
         for os_type in ["linux", "macos", "windows"]:
             for python_version in PYTHON_VERSIONS:
-                w += build_workflow_pair(btype, os_type, python_version, filter_branch, prefix, upload)
+                fb = filter_branch
+                if not fb and (os_type == 'linux' and
+                               btype == 'wheel' and
+                               python_version == '3.8'):
+                    # the fields must match the build_docs "requires" dependency
+                    fb = '/.*/'
+                w += build_workflow_pair(btype, os_type, python_version, fb, prefix, upload)
 
     if not filter_branch:
         # Build on every pull request, but upload only on nightly and tags
-        w += build_doc_job(None)
+        w += build_doc_job('/.*/')
         w += upload_doc_job('nightly')
         w += docstring_parameters_sync_job(None)