ci: grab correct incremental artifacts

[kuisathaverat]

The artifacts are not got by the incremental process because are not in the correct place. I cannot use the default implementation of prepareToPublishIncrementals because it gives me the following error due the .m2 folder used is the system .m2 and contains tons of artifacts.

22:22:27  Archiving artifacts
22:22:27  java.lang.InterruptedException: no matches found within 10000
22:22:27  	at hudson.FilePath$ValidateAntFileMask.hasMatch(FilePath.java:2865)
22:22:27  	at hudson.FilePath$ValidateAntFileMask.invoke(FilePath.java:2744)
22:22:27  	at hudson.FilePath$ValidateAntFileMask.invoke(FilePath.java:2725)
22:22:27  	at hudson.FilePath$FileCallableWrapper.call(FilePath.java:3112)
22:22:27  Also:   hudson.remoting.Channel$CallSiteStackTrace: Remote call to EC2 (aws) - High memory ubuntu 18.04  (i-0f6f4269e566d8d4a)
22:22:27  		at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1800)
22:22:27  		at hudson.remoting.UserRequest$ExceptionResponse.retrieve(UserRequest.java:357)
22:22:27  		at hudson.remoting.Channel.call(Channel.java:1001)
22:22:27  		at hudson.FilePath.act(FilePath.java:1070)
22:22:28  		at hudson.FilePath.act(FilePath.java:1059)
22:22:28  		at hudson.FilePath.validateAntFileMask(FilePath.java:2723)
22:22:28  		at hudson.tasks.ArtifactArchiver.perform(ArtifactArchiver.java:270)
22:22:28  		at jdk.internal.reflect.GeneratedMethodAccessor1377.invoke(Unknown Source)
22:22:28  		at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
22:22:28  		at java.base/java.lang.reflect.Method.invoke(Method.java:566)
22:22:28  		at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:92)
22:22:28  		at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:70)
22:22:28  		at