maven-settings.xml

<!-- This file provides passwords and key details to the Maven plugins that sign our artifacts 
     and deploy them to the OSSRH repository. The secret information is passed in with 
     Travis CI secure environment variables in .travis.yml. -->
<settings>
  <servers>
    <server>
      <id>ossrh</id>
      <username>${env.OSSRH_JIRA_USERNAME}</username>
      <password>${env.OSSRH_JIRA_PASSWORD}</password>
    </server>
  </servers>
  <profiles>
    <profile>
      <id>ossrh</id>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
      <properties>
        <gpg.executable>gpg</gpg.executable>
        <gpg.keyname>${env.GPG_KEY_NAME}</gpg.keyname>
        <gpg.passphrase>${env.GPG_PASSPHRASE}</gpg.passphrase>
      </properties>
    </profile>
  </profiles>
</settings>