Fixed groovy plugin apply order

[rainboyan]

Fixed error:
Script '/common-plugin.gradle' line: 3

• What went wrong:
  A problem occurred evaluating script.

Failed to apply plugin 'org.gradle.groovy'.
Cannot add task 'groovydoc' as a task with that name already exists.

[rainboyan]

@puneetbehl have time to check this? I need this to build grails-async.

[puneetbehl]

Thank you for your time. I think for Gradle 6 or later, overriding a task is not allowed. Could you please describe how changing the order affect the above issue?

[rainboyan]

I use gradle 6.9 to build grails/grails-async, may be org.grails.grails-plugin overriding groovydoc task, but when changing the order, build success.
Please check it if you have time. Thank you for your time,
I want release a new version with next grails release train, Any help if I can.

https://github.com/rainboyan/grails-async/tree/5.0.x

[rainboyan]

@puneetbehl yes, GrailsGradlePlugin extends Groovy. So it should be applied after groovy plugin.