## Open & import the project

In your IDEA, `File` - `Open`, select `.teamcity/pom.xml`, `import as project`, and you'll have a Maven project.

## Project structure

Mostly a standard Maven project structure. The entry point `settings.kts` defines the TeamCity project.

There are 3 subprojects in the TeamCity project hierarchy: `Check` for Gradle builds, `Promotion` for releasing Gradle versions, `Util` for miscellaneous utilities.

            this.setSystemPropertiesOfTestJVM("latest")
            this.systemProperties["org.gradle.integtest.crossVersion"] = "true"

            // We should always be using JUnitPlatform at this point, so don't call useJUnitPlatform(), else this will
            // discard existing options configuration and add a deprecation warning.  Just set the existing options.

        val extension = this.extensions.create<ErrorProneSourceSetExtension>("errorprone", project.objects.property<Boolean>())
        // Enable it only for the main source set by default, as incremental Groovy
        // joint-compilation doesn't work with the Error Prone annotation processor
        extension.enabled.convention(this.name == "main")

        project.dependencies.addProvider(
            annotationProcessorConfigurationName,

                val matchResult = OLD_RELEASE_PATTERN.find(branchName)
                if (matchResult == null) {
                    null
                } else {
                    (matchResult.groupValues[1].toInt() - 4).apply {
                        require(this in 2..23)
                    }
                }
            }
        }
    }

    val isMainBranch: Boolean
        get() = isMaster || isRelease

                val agentNumEnv = System.getenv("USERNAME").replaceFirst("tcagent", "")
                if (Regex("""\d+""").containsMatchIn(agentNumEnv)) {
                    return agentNumEnv.toInt()
                }
            }
            return 1
        }