Use convention method to set task property defaults

[3flex]

https://docs.gradle.org/7.5.1/userguide/lazy_configuration.html#applying_conventions

Often you want to apply some convention, or default value, to a property to be used if no value has been configured for the property. You can use the convention() method for this. This method accepts either a value or a Provider and this will be used as the value until some other value is configured.

This means that whenever the plugin is applied, it will apply only default values, and if the value was set anywhere else in the build script, the convention will not overwrite it.