wp-config.php to use REPOMAN_PLUGIN_INDEX_PATH which allows hosts and agencies to provide their own plugin index without forking the plugin.Example:
define( 'REPOMAN_PLUGIN_INDEX_PATH', '/var/www/config/plugin-repos.json' );
Currently, RepoMan does not provide a filter, constant, or custom endpoint to override the default plugin index, which is loaded from the bundled file named plugin-repos.json.
The easiest solution at this point is to replace that JSON file with your own version containing only the GitHub repos you want available. Because RepoMan is designed to run as an MU plugin, it should not be overwritten by WordPress updates, and in most settings it will not be changed unless you explicitly change it yourself.
If you want to be extra secure, you can also use a small cron job or script to reapply your custom JSON file after updates or on a daily schedule, etc.
In the near future, we plan to expose a filter or endpoint so that RepoMan can load a custom JSON file path without having to replace the bundled file at all. As soon as that becomes available I will update this answer.
Also note that RepoMan is designed to work with repos that declare support for Git Updater using the required plugin headers, so make sure your own repos include these headers as well.
Disclosure: I am the developer of RepoMan
#Customize #GitHub #plugins #RepoMan #install

