feat: add sbt-pre-merge and sbt-post-merge reusable workflows

[Tushar-Jupiter]

Summary

• Adds sbt-pre-merge.yml and sbt-post-merge.yml reusable workflows as SBT equivalents of the existing jvm-pre-merge.yml / jvm-post-merge.yml
• Scala SBT consumer services (built on money.jupiter.scala-dependency-management) can now delegate CI to two lines, matching the pattern nexus uses
• Setup steps are inlined (no new composite action — 2 workflows don't warrant it)
• ECR build/push is inlined since ecr-build-push hard-codes ./gradlew; SBT uses sbt jib

Consumer usage

# .github/workflows/sbt-pre-merge.yml
jobs:
  check:
    uses: jupitermoney/github-workflows/.github/workflows/sbt-pre-merge.yml@main
    with: { java_version: "21" }
    secrets: inherit

# .github/workflows/sbt-post-merge.yml
jobs:
  publish:
    uses: jupitermoney/github-workflows/.github/workflows/sbt-post-merge.yml@main
    with:
      java_version: "21"
      image_name: my-service
    secrets: inherit

Consumer must also set in build.sbt:

jibToImage := s"${sys.env.getOrElse("ECR_REGISTRY", "454518750364.dkr.ecr.ap-south-1.amazonaws.com")}/${name.value}:${sys.env.getOrElse("DOCKER_IMAGE_TAG", version.value)}"

Test plan

• Open a PR in a test Scala consumer service using sbt-pre-merge.yml — confirm build-test job runs sbt compile test and sbt sonarScanIfEnabled
• Push to master in that service — confirm build-push job runs sbt jib and image appears in ECR with rc-{sha} tag
• Confirm is_library: true skips the build-push job

🤖 Generated with Claude Code

[jm-bot-ci]

@Tushar-Jupiter: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[jm-bot-ci]

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