@Big11 Here is the answer:

1. Install the SynoCommunity package source
2. Install ‘git’ using the package manager
3. Now you can use ‘git’ commands from the CLI while SSHed into the Synology.

How to install SynoCommunity:
A. This guide here: https://sys-advisor.com/en/2017/11/05/tuto-synology-comment-ajouter-le-depot-synocomunity-2/
B: Google “add synocommunity to synology” it if that link becomes unavailable.