[CI] Doc on release tag (#2116)

Author: Vincent Moens

.github/workflows/docs.yml

@@ -5,6 +5,9 @@ on:
     branches:
       - main
       - release/*
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]
+      - v[0-9]+.[0-9]+.[0-9]+-rc[0-9]+
   pull_request:
     branches:
       - "*"