Is your feature request related to a problem? Please describe.

Proper OpSec requires expiring OAuth tokens -> Expiring OAuth tokens means needing to update CMake toolchains entirely too often. Luckily, every GH Repo can be accessed via SSH (https://github.com/REPO -> [email protected]:REPO) which allows us to use our super-secret-ssh-key to access private repositories without the headache!

Seems that you've thought about this based on the comments, but no solution other than manual specification of the URL as an SSH URL is possible at this time. As there's a one-to-one with (default) HTTPS/SSH access to GH, it might make sense to enable this with a simple toggle

Describe the solution you'd like

Having an option (e.g. CMAIZE_GITHUB_USE_SSH) to switch to SSH GH access would be desireable. I've done this locally via addition of the following to CMaize/cmake/cmaize/package_managers/cmake/dependency/github.cmake after URL discovery:

if ( _bd_private AND CMAIZE_GITHUB_USE_SSH )
  string(REPLACE "github.com/" "${CMAIZE_GITHUB_SSH_PREFIX}:" _bd_url "${_bd_url}")
endif( )

where CMAIZE_GITHUB_SSH_PREFIX defaults to [email protected]. If this is a sufficient fix, I'll PR it, if there's more that would need to be done infrastructurally, this is meant to start the discussion.