Copy classes from alternative target

build.sbt

copyProbeClasses := {
        val log = streams.value.log

        val probeTarget = new File(crossTarget.value,  "probe-classes")
        (probeTarget ** "*" filter(_.isFile)).get.foreach { fl =>
          log.info("Copying " + fl.relativeTo(probeTarget).get.toString)
          Files.copy(fl.toPath, new File((classDirectory in Compile).value, fl.relativeTo(probeTarget).get.toString).toPath, REPLACE_EXISTING)
        }
      }