Authentication support

[adongy]

Is your feature request related to a problem? Please describe.
Hello, when using a remote configuration to use Artifactory for example, there is no documented way to use credentials (.netrc or user/password in URL)

Describe the solution you'd like
Document (and implement if needed) how to specify credentials to authenticate to a remote.

Describe alternatives you've considered

Additional context
tofuenv explicitely supports .netrc for that usecase.

Thanks!

[dvaumoron]

http.Get in net/http does not seem to handle .netrc. So this need an implementation step.

[adongy]

I see. I would add that even .netrc may not be optimal support, as it's hard to put environment variables inside.

For example, https://docs.npmjs.com/using-private-packages-in-a-ci-cd-workflow#create-and-check-in-a-project-specific-npmrc-file is not possible as .netrc does not evaluate environment variables.

If I could choose, I would like it if there was additionnal variables for remote to specify user/password, or allow specifying the user/password in the URL.

Thanks.

[dvaumoron]

https://user:password@host.org should work, however I can add some env var to have a better support.