.travis.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>
            <id>ossrh</id>
            <username>${SONATYPE_USERNAME}</username>
            <password>${SONATYPE_PASSWORD}</password>
        </server>
    </servers>

    <profiles>
        <profile>
            <id>ossrh</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <properties>
                <gpg.executable>${GPG_EXECUTABLE}</gpg.executable>
                <gpg.keyname>${GPG_KEYNAME}</gpg.keyname>
                <gpg.passphrase>${GPG_PASSPHRASE}</gpg.passphrase>
                <!-- Tell gpg to NOT use the default keyring from the current user's home -->
                <gpg.defaultKeyring>false</gpg.defaultKeyring>
                <!-- Tell gpg to use the keyrings -->
                <gpg.publicKeyring>${TRAVIS_BUILD_DIR}/pubring.gpg</gpg.publicKeyring>
                <gpg.secretKeyring>${TRAVIS_BUILD_DIR}/secring.gpg</gpg.secretKeyring>
            </properties>
        </profile>
    </profiles>
</settings>