FeatureFlag plugin does not support Configuration Cache

[ganadist]

Configuration Cache(link) is a new (still experimental) gradle feature to improve build performance since Gradle 6.6

When Configuration Cache is enabled, gradle with Feature Flag plugin shows following error

- Task `:app:generateDebugFeatureFlag` of type `com.linecorp.android.featureflag.FeatureFlagTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.4.2/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution

See the complete report at file:///home/user/MyProject/build/reports/configuration-cache/9i43owv2px0b29dm55tacf45w/5y0bvx624z6zaw9tntypso0nv/configuration-cache-report.html
> Invocation of 'Task.project' by task ':app:generateDebugFeatureFlag' at execution time is unsupported.

org.gradle.api.InvalidUserCodeException: Invocation of 'Task.project' by task ':app:generateDebugFeatureFlag' at execution time is unsupported.
	at org.gradle.configurationcache.initialization.DefaultConfigurationCacheProblemsListener.onTaskExecutionAccessProblem(ConfigurationCacheProblemsListener.kt:74)
	at org.gradle.configurationcache.initialization.DefaultConfigurationCacheProblemsListener.onProjectAccess(ConfigurationCacheProblemsListener.kt:53)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.event.DefaultListenerManager$ListenerDetails.dispatch(DefaultListenerManager.java:464)
	at org.gradle.internal.event.DefaultListenerManager$ListenerDetails.dispatch(DefaultListenerManager.java:446)
	at org.gradle.internal.event.AbstractBroadcastDispatch.dispatch(AbstractBroadcastDispatch.java:61)
	at org.gradle.internal.event.DefaultListenerManager$EventBroadcast$ListenerDispatch.dispatch(DefaultListenerManager.java:434)
	at org.gradle.internal.event.DefaultListenerManager$EventBroadcast.dispatch(DefaultListenerManager.java:221)
	at org.gradle.internal.event.DefaultListenerManager$EventBroadcast.dispatch(DefaultListenerManager.java:192)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
	at com.sun.proxy.$Proxy307.onProjectAccess(Unknown Source)
	at org.gradle.api.internal.AbstractTask.notifyProjectAccess(AbstractTask.java:1053)
	at org.gradle.api.internal.AbstractTask.getProject(AbstractTask.java:237)
	at org.gradle.api.DefaultTask.getProject(DefaultTask.java:59)
	at com.linecorp.android.featureflag.FeatureFlagTask.action(FeatureFlagTask.kt:95)

See also https://github.com/gradle/gradle/issues/13490