The \"install\" goal copies the artifact to the target directory and to the local repository.
How can I tell Maven to copy it also to a given directory
According to http://maven.apache.org/plugins/maven-dependency-plugin/examples/copying-artifacts.html you can copy the just built artifact to a specific directory:
[...]
org.apache.maven.plugins
maven-dependency-plugin
2.8
copy-installed
install
copy
${project.groupId}
${project.artifactId}
${project.version}
${project.packaging}
some-other-place
[...]