Simplify the "Update gitlab-shell" instructions from the "Installation from source" and Upgrade guides
Could we replace
cd /home/git/gitlab-shell
sudo -u git -H git fetch --all --tags
sudo -u git -H git checkout v5.0.0
with something like
cd /home/git/gitlab-shell
sudo -u git -H git fetch --all --tags
sudo -u git -H git checkout v$(</home/git/gitlab/GITLAB_SHELL_VERSION)
It could avoid the tedious update of the gitlab-shell version in these files... /cc @rspeicher @twk3