Release 3.1.0-RC1

[Kordyjan]

• Look at the milestone of the version being released. Move all the open issues from it to the next milestone.
• Publish artifacts to Maven via CI
  • Create branch release-3.1.0 from master
  • On that branch
    • In Build.scala: Set baseVersion to 3.1.0-RC1
    • In Build.scala: Set previousDottyVersion according to the instructions in the comment to that variable.
    • In tasty/src/dotty/tools/tasty/TastyFormat.scala: Set ExperimentalVersion to 0 to indicate a stable release; make sure MajorVersion and MinorVersion are set correctly for the release.
    • Tag the branch as 3.1.0-RC1
  • On master:
    • In Build.scala: Set baseVersion to the next version to be released
• Announce the release
  • Publish releases for the RC and stable versions on GitHub Releases
  • Make an announcement thread on https://contributors.scala-lang.org

[bishabosha]

please can this wait for #13386

[nicolasstucki]

It needs to wait for all items in https://github.com/lampepfl/dotty/milestone/27, #13386 is in there.

[Kordyjan]

@bishabosha @nicolasstucki Sure. I only wanted to have an issue with a checklist for tracking the progress. I will start the procedure on Monday, or later if it is needed.

[nicolasstucki]

@Kordyjan we have closed all issues/PRs from the 3.1.0 milestone. We should let the CI build and test a nightly build today. We can start the release process tomorrow.