Merge branch 'add-tags-to-fetch' into 'master'

Add --tags to fetching gitlab-shell to ensure tags are downloaded

Closes #15525

See merge request !3896

doc/update/8.6-to-8.7.md

@@ -45,7 +45,7 @@ sudo -u git -H git checkout 8-7-stable-ee
 
 ```bash
 cd /home/git/gitlab-shell
-sudo -u git -H git fetch --all
+sudo -u git -H git fetch --all --tags
 sudo -u git -H git checkout v2.7.2
 ```