.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">
  <servers>
    <server>
      <id>sonatype</id>
      <username>${env.SONATYPE_USER}</username>
      <password>${env.SONATYPE_PASSWORD}</password>
    </server>
    <server>
      <id>bintray-iotaledger-maven</id>
      <username>${env.BINTRAY_USER}</username>
      <password>${env.BINTRAY_KEY}</password>
    </server>
    <server>
      <id>jfrog-snapshots</id>
      <username>${env.BINTRAY_USER}</username>
      <password>${env.BINTRAY_KEY}</password>
    </server>
    <server>
      <id>github.com</id>
      <username>${env.GH_USER}</username>
      <password>${env.GH_TOKEN}</password>
    </server>
  </servers>
</settings>