[HTTP] [CC-1966] [Kotlin] Use gradle and upgrade to 2.2

[andy1li]

Note

Migrates Kotlin HTTP server starter/solutions from Maven/Kotlin 2.0 to Gradle/Kotlin 2.2, updating build/run scripts, project structure, configs, CI, and Docker accordingly.

• Build system & versioning:
  • Switch from Maven to Gradle (app/build.gradle.kts, settings.gradle.kts, gradle/libs.versions.toml, gradle.properties); update .gitignore for Gradle.
  • Upgrade runtime from kotlin-2.0 to kotlin-2.2 in codecrafters.yml; add dockerfiles/kotlin-2.2.Dockerfile (Gradle JDK24 base).
• Scripts:
  • Update *.codecrafters/compile.sh and your_program.sh to gradle distTar and extract distribution.
  • Change *.codecrafters/run.sh to execute distributions/app/bin/app instead of java -jar.
• Project structure & docs:
  • Move entry point to app/src/main/kotlin/App.kt; update README.md, explanation.md references.
  • Update starter_templates and solutions to mirror Gradle layout; adjust config.yml (required_executable to Gradle, user_editable_file path).
• CI:
  • Enhance .github/workflows/test.yml with with.sdkRef: main, permissions, and secrets: inherit.

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[linear]

CC-1966 [Kotlin] Use gradle and upgrade to 2.2