nexus-settings.xml

<?xml version="1.0"?>
<settings>

  <pluginGroups>
    <pluginGroup>org.mule.tools</pluginGroup>
  </pluginGroups>

  <servers>
    <server>
      <id>MuleRepository</id>
      <username>${nexus_username}</username>
      <password>${nexus_password}</password>
    </server>
  </servers>

  <profiles>
    <profile>
      <id>Mule</id>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
      <repositories>
        <repository>
          <id>MuleRepository</id>
          <name>MuleRepository</name>
          <url>https://repository.mulesoft.org/nexus-ee/content/repositories/releases-ee/</url>
          <layout>default</layout>
          <releases>
            <enabled>true</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </repository>     
      </repositories>
    </profile>
  </profiles>
</settings>