.settings.xml

<settings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/SETTINGS/1.0.0" xsi:schemalocation="http://maven.apache.org/SETTINGS/1.0.0
                      http://maven.apache.org/xsd/settings-1.0.0.xsd">
    <servers>
        <server>
            <!-- Maven Central Deployment -->
            <id>ossrh</id>
            <username>${env.SONATYPE_USERNAME}</username>
            <password>${env.SONATYPE_PASSWORD}</password>
        </server>
    </servers>

    <profiles>
      <profile>
        <id>ossrh</id>
        <activation>
          <activeByDefault>false</activeByDefault>
        </activation>
        <properties>
          <gpg.executable>${env.GPG_EXECUTABLE}</gpg.executable>
          <gpg.passphrase>${env.GPG_PASSPHRASE}</gpg.passphrase>
        </properties>
      </profile>
    </profiles>
</settings>