settings.xml

<settings>
  <servers>
    <server>
      <id>sonatype-nexus-snapshots</id>
      <username>${userID}</username>
      <password>${password}</password>
    </server>
    <server>
      <id>sonatype-nexus-staging</id>
      <username>${userID}</username>
      <password>${password}</password>
    </server>
  </servers>
  <profiles>
    <profile>
      <id>gpg</id>
      <properties>
        <gpg.passphrase>${gpg.passphrase}</gpg.passphrase>
      </properties>
    </profile>
  </profiles>
</settings>