Release Scala 2.12.21-M2 (for JDK 25)

[SethTisue]

Stage

• Make sure there are no stray staging repos on Sonatype
• Trigger a custom build on travis
  • Select the correct branch
  • Custom config: before_script: export SCALA_VER_BASE=2.12.21 SCALA_VER_SUFFIX=-M2
  • https://app.travis-ci.com/github/scala/scala/builds/274910669
• Create the scala/scala tag locally: git tag -s -m "Scala 2.12.21-M2" v2.12.21-M2 743891dfb1a5510cdec019aeac20dd575ddd8adf

Release

• Push scala/scala tag: git push https://github.com/scala/scala.git v2.12.21-M2
• Promote staging repos: st_stagingRepoPromote [scala-repo], st_stagingRepoPromote [modules-repo] (or use oss.sonatype.org web UI)

Find the release on Maven Central

• https://repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.12.21-M2/

Afterwards

• Create a scala/scala PR to:
  • update starr.version in /versions.properties
  • Add JDK 25-ea to mergely CI
• Verify that mergely CI is green
  • https://github.com/scala/scala/actions/runs/14482365180