(feat): Generic Git Authentication

[sashokbg]

Feature summary

Allow the user to specify any git url and provide any git auth token (ex: Gitlab)

Problem / motivation

Currently the tool only seems to work with Github private repositories.
The underlying git functions do allow to checkout any type of repository and provide authentication as a token.
I even unit-tested the clone_repo function with my private gitlab instance and it works fine.

To solve the problem I suggest the following modifications, that I am willing to implement and test if accepted.

• Add a new env variable GIT_TOKEN allowing to specify just a token, regardless if github format or other
• Keep the existing GITHUB_TOKEN for compatibility
• Relax the rules for token validation (InvalidGitHubTokenError) and only check token if URL contains github.com
• Update the documentation to mention that it now works with any repository provided you have a "token"

Please let me know what you think.
Thank you for the great tool !

Best Regards
Aleks

Proposed solution

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Alternatives considered

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