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 https://maven.apache.org/xsd/settings-1.0.0.xsd">
    <servers>
        <server>
            <!-- This ID should match the repository ID in your POM file -->
            <id>github</id>
            <username>${env.GH_USERNAME}</username>
            <password>${env.GH_PACKAGE_TOKEN}</password>
        </server>
    </servers>

    <profiles>
        <profile>
            <id>github</id>
            <repositories>
                <repository>
                    <id>github</id>
                    <url>https://maven.pkg.github.com/enduco/onesignal-java-api</url>
                </repository>
            </repositories>
            <pluginRepositories>
                <pluginRepository>
                    <id>github</id>
                    <url>https://maven.pkg.github.com/enduco/onesignal-java-api</url>
                </pluginRepository>
            </pluginRepositories>
        </profile>
    </profiles>

    <activeProfiles>
        <activeProfile>github</activeProfile>
    </activeProfiles>
</settings>