To debug a gradle script, you have to connect a debugger with the running gradle process.
You have to set the environment variable GRADLE_OPT (like here in bash) :
export GRADLE_OPTS="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005"
and then start your task with the option --no-daemon.
Then you can connect to your gradle process using the remote configuration of intellij idea.
You create a remote configuration by clicking
Run / Edit Configurations... / + / Remote
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