Dirty repo in "gradle release" smoke test on CI

[tlinkowski]

https://ci.appveyor.com/project/tlinkowski/tlinkowski-superpom/builds/26466238/tests

org.gradle.testkit.runner.UnexpectedBuildFailure: Unexpected build execution failure in C:\projects\tlinkowski-superpom\subprojects\my-superpom-gradle-plugin\..\..\test-data\sample-project with arguments [release, -Preckon.stage=final, --stacktrace]

Output:

FAILURE: Build failed with an exception.

* Where:
Build file 'C:\projects\tlinkowski-superpom\test-data\sample-project\build.gradle.kts' line: 19

* What went wrong:
An exception occurred applying plugin request [id: 'pl.tlinkowski.gradle.my.superpom', version: '']
> Failed to apply plugin [class 'org.kordamp.gradle.plugin.base.BasePlugin']
   > Could not create an instance of type org.kordamp.gradle.plugin.base.ProjectConfigurationExtension.
      > Cannot release a final or significant stage without a clean repo.

* Try:
Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.api.plugins.InvalidPluginException: An exception occurred applying plugin request [id: 'pl.tlinkowski.gradle.my.superpom', version: '']
	at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.exceptionOccurred(DefaultPluginRequestApplicator.java:247)
	at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.applyPlugin(DefaultPluginRequestApplicator.java:229)
	at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.applyPlugins(DefaultPluginRequestApplicator.java:159)
	at org.gradle.kotlin.dsl.provider.PluginRequestsHandler.handle(PluginRequestsHandler.kt:49)
	at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost.applyPluginsTo(KotlinScriptEvaluator.kt:190)
	at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.applyPluginsTo(Interpreter.kt:364)
	at Program.execute(Unknown Source)
	at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.eval(Interpreter.kt:506)
	at org.gradle.kotlin.dsl.execution.Interpreter.eval(Interpreter.kt:184)
	at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator.evaluate(KotlinScriptEvaluator.kt:114)
	at org.gradle.kotlin.dsl.provider.KotlinScriptPluginFactory$create$1.invoke(KotlinScriptPluginFactory.kt:51)
	at org.gradle.kotlin.dsl.provider.KotlinScriptPluginFactory$create$1.invoke(KotlinScriptPluginFactory.kt:36)
	at org.gradle.kotlin.dsl.provider.KotlinScriptPlugin.apply(KotlinScriptPlugin.kt:34)
	at org.gradle.configuration.BuildOperationScriptPlugin$1$1.run(BuildOperationScriptPlugin.java:69)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:402)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:394)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:92)
	at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
	at org.gradle.configuration.BuildOperationScriptPlugin$1.execute(BuildOperationScriptPlugin.java:66)
	at org.gradle.configuration.BuildOperationScriptPlugin$1.execute(BuildOperationScriptPlugin.java:63)
	at org.gradle.configuration.internal.DefaultUserCodeApplicationContext.apply(DefaultUserCodeApplicationContext.java:48)
	at org.gradle.configuration.BuildOperationScriptPlugin.apply(BuildOperationScriptPlugin.java:63)
	at org.gradle.configuration.project.BuildScriptProcessor$1.run(BuildScriptProcessor.java:44)
	at org.gradle.internal.Factories$1.create(Factories.java:25)
	at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:200)
	at org.gradle.api.internal.project.DefaultProjectStat

[tlinkowski]

Ideas:

1. Find out what files cause this (before the above error triggers, print out all dirty files in VersionConfigPlugin if release.stage == final).