dev-files/settings.xml

<?xml version="1.0" encoding="UTF-8"?>
<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">

    <!-- THIS IS A TEMPLATE/SAMPLE FOR THE ~/.m2/settings.xml CONFIGURATION FILE, USED e.g. WHEN PERFORMING A RELEASE -->
    <!-- Values should be placed into environment variables (preferred), though you _can_ insert the values directly below. -->

    <servers>
        <server>
            <!-- Credentials for Sonatype OSSRH (OSS Repository Hosting) -->
            <!-- These are the same credentials you use for https://oss.sonatype.org/ and their JIRA ticketing system. -->
            <!-- https://central.sonatype.org/pages/apache-maven.html -->
            <id>ossrh</id>
            <username>${env.MAVEN_OSSRH_USERNAME}</username>
            <password>${env.MAVEN_OSSRH_PASSWORD}</password>
        </server>
    </servers>

    <profiles>
        <profile>
            <id>ossrh</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <properties>
                <!-- You may need to adjust to the reflect the executable within your environment e.g. `gpg2` -->
                <gpg.executable>gpg</gpg.executable>
                <gpg.keyname>${env.MAVEN_GPG_KEYNAME}</gpg.keyname>
                <gpg.passphrase>${env.MAVEN_GPG_PASSPHRASE}</gpg.passphrase>
            </properties>
        </profile>
    </profiles>

</settings>