This mod adds git to openssh-server, to be installed/updated during container start.
In openssh-server docker arguments, set an environment variable DOCKER_MODS=linuxserver/mods:openssh-server-git
If adding multiple mods, enter them in an array separated by |, such as DOCKER_MODS=linuxserver/mods:openssh-server-git|linuxserver/mods:openssh-server-mod2