I have a situation where it would be useful to display a message to users when they push or pull or fetch from the command line from our internally hosted Github Enterprise service. After some googling, I saw instances of folks wanting to disable the MOTD from appearing, and there was one suggestion about how to add an /etc/banner and add that to /etc/ssh/sshd_config.
The /etc/banner does show up when sshing into the server, but it doesn't show up for any git-ssh operations.