Maven-archiver automatically creates "Built-By: <username>", "Build-Jdk: <detailed JDK version>" and "Created-By: <Maven detailed version>" Manifest entries.
In the frame of a reproducible build (cf. MNG-6276) these entries make the build not reproducible.
Maven-archiver should propose an option to disable the creation of these non-reproducible manifest entries.
Then if you want the usual value of Built-By, you must add the following entry