3.4.1 & 3.4.2-RC1 Release procedure

[Kordyjan]

Switch development from 3.4.2 to 3.5.0

• Create branch release-3.4.2 from main
• On main in Build.scala: Set baseVersion to 3.5.0:
  • Set base version 3.5.0-RC1 #20025

Publish 3.4.1 artifacts to Maven Central via CI:

• On release-3.4.1 branch:
  • In Build.scala: Set baseVersion to 3.4.1
  • In Build.scala: Set previousDottyVersion to 3.4.0
  • Set the TASTy version to 28.4-0
  • In changelogs add file with a changelog
• Tag the branch as 3.4.1
• Build

Set bootstrapping for future versions on main:

• In Build.scala: Set previousDottyVersion to 3.4.1
• In Build.scala: Set referenceVersion to 3.4.1
• Check and update project/MiMaFilters.scala
• Setup versions for 3.5.0 #20048

Publish 3.4.2-RC1 artifacts to Maven Central via CI:

• On release-3.4.2 branch
  • In changelogs add file with a changelog
  • In Build.scala: Set previousDottyVersion to 3.4.1
  • In Build.scala: Set referenceVersion to 3.4.1
• Tag the branch as 3.4.2-RC1
• Build

Set bootstrapping for future versions version on main:

• In Build.scala: Set referenceVersion to 3.4.2-RC1
• Setup versions for 3.5.0 #20048

Confirm that the tooling is working correctly:

• Metals:
  • 3.4.1
  • 3.4.2-RC1
• Scala CLI:
  • 3.4.1
  • 3.4.2-RC1
• Scala Native:
  • 3.4.1
  • 3.4.2-RC1
• Scastie:
  • 3.4.1
  • 3.4.2-RC1
• Scala DAP:
  • 3.4.1
  • 3.4.2-RC1

Update the ecosystem:

• Release 3.4.1 to SDKMAN
• Update the templates and examples projects:
  • scala3-mill-example-project:
    • Update Scala to 3.4.1 scala3-mill-example-project#23
  • scala3-cross.g8
    • Update Scala to 3.4.1 scala3-cross.g8#102
  • scala3-staging.g8
    • Update Scala to 3.4.1 scala3-staging.g8#46
  • scala3-tasty-inspector.g8
    • Update Scala to 3.4.1 scala3-tasty-inspector.g8#41
  • scala3.g8
    • Update Scala to 3.4.1 scala3.g8#138

Prepare the documentation:

• Merge release-3.4.1 into language-reference-stable
• Publish API docs for 3.4.1
• Add 3.4.1 to the version list in API docs
• Update docs.scala-lang
  • Add api link to 3.4.1 docs.scala-lang#3003

Announce the releases:

• Make both GitHub releases public
• Publish an announcement on https://scala-lang.org/blog:
  • Add 3.4.1 announcement scala-lang#1634
• Open the 3.4.2 tracking thread on https://contributors.scala-lang.org:
  • https://contributors.scala-lang.org/t/3-4-2-release-thread/6613
• Close the 3.4.1 milestone
• Make sure all PRs merged and issues fixed in 3.4.2-RC1 are in the 3.4.2 milestone