Support Basic Auth authentication for generic Git provider

[talpa-robin]

Is your feature request related to a problem? Please describe.
We have created our own Powerpipe Mod in a private GitLab repository. Unfortunately it seems like right now authentication to mod repositories (when installing via Powerpipe) only supports the way how GitHub does it (https://github.com/turbot/pipe-fittings/blob/d7decaf1e82d8538970cc7d7821d5a8f1c3994d4/modinstaller/git.go#L86-L104), i.e. with the token as username or token as password and "x-access-token" as the username.

Describe the solution you'd like
I'd like a way where I'm able to define the basic auth credentials freely, so that I can make GitLab authentication work. In GitLab for example the username is "gitlab-ci-token" and the password is a token provided via $CI_JOB_TOKEN. Bonus points for being able to configure the credentials for each host, similar to how .git-credentials does it (https://git-scm.com/docs/gitcredentials).

Describe alternatives you've considered
I've tried using this style of repo HTTPS urls https://username:[email protected], it didn't work (I guess URL parsing fails). I've tried setting credentials via the .git-credentials file $HOME and hoped that the used git SDK would implicitly look for credentials there - unfortunately not. My fallback scenario now was doing a git clone beforehand and then pointing Powerpipe to the local folder, which is not optimal.

[pskrbasu]

Hey @talpa-robin, thanks for raising this issue. This would be a great enhancement, but currently, we don't have plans to support this yet. But surely, this would be a great addition. If you're interested in working on it, please go ahead (we love user contributions).

[talpa-robin]

Hey @pskrbasu, sure, could try that. Doesn't seem to be too complicated (at least supporting basic auth in the GitUrl). It seems to be a change in the https://github.com/turbot/pipe-fittings/blob/develop/modinstaller though. Any documentation of advice on how to test changes to the pipe-fitting directly with powerpipe?

[pskrbasu]

@talpa-robin Apologies for the delay(I was out on vacation). Please take a look at the Developing section. You will need to add a replace in your powerpipe go.mod file that directs it to your local pipe-fittings repo changes, to test the local pipe-fitings changes.

Let me know if you need any other help.