Fragment files copied to Helm output directories

[manusa]

Description

Helm source fragment files (Chart.helm.yaml and values.helm.yaml) are copied to the Helm output directory ((target|build)/jkube).

These are source files that shouldn't be propagated in their raw state.

[manusa]

This also affects other fragments. Might be just the default behavior. Further analysis is needed.

[manusa]

The behavior is fine, since this is also the working directory which is used by the DefaultResourceService to pre-process resources.

The directory is configured by means of jkube.workDir which defaults to ${project.build.directory}/jkube.

Since this directory is for internal use, and shouldn't really affect users, I propose to change it to jkube-temp.