heroku-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">
    <activeProfiles>
        <activeProfile>production</activeProfile>
        <activeProfile>war</activeProfile>
        <activeProfile>heroku</activeProfile>
    </activeProfiles>
</settings>