[CI] Schedule workflows for releases (#2114)

Author: Vincent Moens

.github/workflows/docs.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - main
+      - release/*
   pull_request:
     branches:
       - "*"

.github/workflows/wheels.yml

@@ -4,7 +4,7 @@ on:
     types: [opened, synchronize, reopened]
   push:
     branches:
-      - release/0.4.0
+      - release/*
 
 concurrency:
   # Documentation suggests ${{ github.head_ref }}, but that's only available on pull_request/pull_request_target triggers, so using ${{ github.ref }}.