With the rise of version control applications such as git, users require access to the application more often. In a CageFS Environment, it doesn't pose a large security risk, and is quite handy for users to have.
As with any other package, you will need to first install it using the standard yum commands
yum install git
Once it has been installed, you will then have to add the RPM to the CageFS skeleton, and then force a rebuild to ensure it's allowed for all users.
cagefsctl --addrpm git
On this is done, the git application should be available correctly within CageFS for all users to utilise via SSH.