Add this to your {{$HOME/.m2/settings.xml}} to enable publishing to the Apache Nexus repo.  This works for snapshots or staging final binaries.

{code:xml|title=.m2/settings.xml}
<settings>
  <servers>
    <server>
      <id>apache.snapshots.https</id>
      <username>yourapacheid</username>
      <password>yourapachepass</password>
    </server>
    <server>
      <id>apache.releases.https</id>
      <username>yourapacheid</username>
      <password>yourapachepass</password>
    </server>
  </servers>
</settings>
{code}

Then publish via:

{code}
$ mvn clean deploy
{code}