Add config key for default maven repo and self check url

[meier-christoph]

This PR adds a few additional arguments to cli and config for the default maven repo and the self check uri.

For a full offline run add :

--self-check-uri https://github.example.org \
--default-maven-repo https://nexus.example.org \
--scalafix-migrations /data/config/scalafix-migrations.conf \
--artifact-migrations /data/config/artifact-migrations.conf \
--disable-default-scalafix-migrations

We are using scala-steward in a closed environment with github enterprise and are currently running a fork of scala-steward v0.8, this is a cherry pick from our fork as we would like to switch over to the github apps variant asap

[codecov]

Codecov Report

Merging #1899 (bd627df) into master (d901845) will decrease coverage by 0.01%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##           master    #1899      +/-   ##
==========================================
- Coverage   78.74%   78.72%   -0.02%     
==========================================
  Files         131      131              
  Lines        2263     2266       +3     
  Branches       65       58       -7     
==========================================
+ Hits         1782     1784       +2     
- Misses        481      482       +1     

Impacted Files	Coverage Δ
.../scala/org/scalasteward/core/application/Cli.scala	96.15% <ø> (ø)
...ala/org/scalasteward/core/application/Config.scala	97.29% <75.00%> (-2.71%)	⬇️
...la/org/scalasteward/core/application/Context.scala	86.44% <100.00%> (ø)
...g/scalasteward/core/application/SelfCheckAlg.scala	100.00% <100.00%> (ø)
...lasteward/core/buildtool/BuildToolDispatcher.scala	78.94% <100.00%> (ø)
...a/org/scalasteward/core/buildtool/sbt/SbtAlg.scala	94.87% <100.00%> (ø)

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[fthomas]

I've two questions. Why would you want to override the URL for UrlChecker and how do you override the default Maven repository in other tools like Coursier and sbt? I could imagine that if you're already overriding the default Maven repository for Coursier, maybe we could always query it from Coursier so that there would be no need to override it in Scala Steward too.

[meier-christoph]

We have our own github enterprise running on-prem in an isolated network. The self check would just fail and timeout after a few seconds since github.com is not reachable.

We only use sbt (which is why I haven't touched mill and I am not very familiar with it) and you can actually override the repositories that are used via SBT_OPTS e.g. -Dsbt.repository.config=<file with urls to enterprise repo> and -Dsbt.override.build.repos=true.

If you are using coursier via cli you can also set the repository using args or as environment variable but we don't use coursier outside of sbt v1.

To be honnest I wasn't sure what scala-steward was using the default maven repo for. There was a lot of trial and error befor it worked. For example, I had to build a new container and pre-build scalafmt in standalone mode as by default it would try to fetch some dependencies on the first run via coursier.

[fthomas]

Thanks for the explanation, @meier-christoph. I'm OK with merging this but could please change --self-check-uri to --url-checker-test-url or --url-checker-self-check-url? I think that makes it clearer that the purpose of this URL is to check that the UrlChecker works.

[meier-christoph]

@fthomas thanks for the feedback, I made the changes as you suggested.

[fthomas]

Thanks @meier-christoph!