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
                          https://maven.apache.org/xsd/settings-1.0.0.xsd">
  <servers>
    <server>
      <id>ossrh</id>
      <username>${env.SONATYPE_USERNAME}</username>
      <password>${env.SONATYPE_PASSWORD}</password>
    </server>
    <server>
      <id>${env.GPG_KEYNAME}</id>
      <passphrase>${env.GPG_PASSPHRASE}</passphrase>
    </server>
  </servers>
  <profiles>
    <profile>
      <id>ossrh</id>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
      <properties>
        <gpg.executable>gpg</gpg.executable>
        <gpg.passphrase>${env.GPG_PASSPHRASE}</gpg.passphrase>
        <gpg.keyname>${env.GPG_KEYNAME}</gpg.keyname>
      </properties>
    </profile>
  </profiles>
</settings>