src/assembly/config.xml

<?xml version="1.0" encoding="UTF-8"?>
<assembly>
  <id>config</id>
  <includeBaseDirectory>false</includeBaseDirectory>
  <formats>
    <format>jar</format>
  </formats>
  <fileSets>

    <fileSet>
      <directory>src/main/config</directory>
      <outputDirectory></outputDirectory>
      <includes>
        <include>**</include>
      </includes>
    </fileSet>
  </fileSets>

</assembly>