I’m writing a Jenkins declarative pipeline with this situation.

I build a maven project and, after the build, i should add some file in a specific directory of the project from a second repository.

This is necessary for me to use a repository for file like templates and other thing different from project file. In this mode i can modify templates without modify the maven project.

How can i implement this in Jenkins?

I write the First part, build the project without adding templates file