Simples Assim

You can keep artifacts outside repositories and still support Maven.

<?xml version="1.0" encoding="UTF-8"?>
<project>
  ...
  <distributionManagement>
    <downloadUrl>https://fernandoribeiro.eti.br/sample.zip</downloadUrl>
  </distributionManagement>
 ...
</project>

http://maven.apache.org/pom.html#Distribution_Management