settings.xml

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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>true</activeByDefault>
            </activation>
            <properties>
                <gpg.executable>${env.GPG_EXECUTABLE}</gpg.executable>
                <gpg.passphrase>${env.GPG_PASSPHRASE}</gpg.passphrase>
            </properties>
        </profile>
    </profiles>
</settings>