provide official sbt launch script as default

[SethTisue]

also continue providing sbt-extras, but as sbtx

Olaf has already indicated (on Discord, I think it was?) that this change would be welcome

[SethTisue]

I haven't tested this, but the change seems pretty straightforward.

[SethTisue]

fyi @dwijnand @eed3si9n

[olafurpg]

LGTM thank you! I’ll cut a new release later today.

[olafurpg]

Release is out https://github.com/olafurpg/setup-scala/releases/tag/v13

[sideeffffect]

Hello guys, may I ask what is the motivation for this change? 🙂

[olafurpg]

@sideeffffect I think this PR fixes the issues here #35

[SethTisue]

@sideeffffect see sbt/sbt#2889, where I have just left some fresh commentary (since this is bigger than just setup-scala)

[SethTisue]

as for setup-scala specifically, I just noticed at https://github.com/olafurpg/setup-scala/releases/tag/v13 that it says:

csbt and sbtx launcher scripts will be removed in the next release. The official sbt script will be the only supported script going forward

that surprises me a bit, actually. I personally don't mind, but perhaps someone else will want to make a pitch for retaining the alternates?

[olafurpg]

@SethTisue I’m not using those scripts and I don’t think other people are using them either. It would be nice to avoid installing those scripts.