Allow custom repositories

[fourth44]

It would be great to define custom ivy/nexus repositories.
Ideally, this configuration would live in some global config file (i.e. ~/.scala-update/config.hocon?)
Perhaps there is some coursier global config for this to piggy-back on?

Imagine a company with a lot of interdependent projects and a private nexus repository.
Ideally, I would have set up an instance of scala-steward long ago, but it's simply to much of a hassle. Scala-update is ideal (apart from requiring to be run manually) as it doesn't need much config or resources to run. However, currently, non-public dependencies are ignored, it would be excellent to configure the local nexus repo.

[ex0ns]

This issue is pretty old, however it seems that as this is using coursier under the hood, the COURSIER_REPOSITORIES variable is correctly used, I tested it today and it worked fine.

Be aware that the native image is built with a cacert and does not use the runtime cacerts, so you might run into some issues with the native-image version if you are using a custom CA.

[kitlangton]

Unfortunately, I don't have much time to try this myself, but I'm completely open to any attempts :D