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">
  <profiles>
    <profile>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
      <properties>
        <gpg.keyname>${env.GPG_KEY_NAME}</gpg.keyname>
      </properties>
      <repositories>
        <repository>
          <id>snapshots-repo</id>
          <url>http://oss.sonatype.org/content/repositories/snapshots</url>
          <releases>
            <enabled>false</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>snapshots-repo</id>
          <url>http://oss.sonatype.org/content/repositories/snapshots</url>
          <releases>
            <enabled>false</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>
  <servers>
    <server>
      <id>sonatype-snapshot</id>
      <username>${env.SONATYPE_USERNAME}</username>
      <password>${env.SONATYPE_PASSWORD}</password>
    </server>
    <server>
      <id>sonatype-staging</id>
      <username>${env.SONATYPE_USERNAME}</username>
      <password>${env.SONATYPE_PASSWORD}</password>
    </server>
  </servers>
</settings>