plugins/src/assembly/assembly.xml

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<assembly xmlns="http://maven.apache.org/ASSEMBLY/2.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/ASSEMBLY/2.0.0 http://maven.apache.org/xsd/assembly-2.0.0.xsd">
    <id>samples</id>
    <formats>
        <format>dir</format>
    </formats>

    <includeBaseDirectory>false</includeBaseDirectory>
    <moduleSets>
        <moduleSet>
            <sources>
                <includeModuleDirectory>false</includeModuleDirectory>
                <fileSets>
                    <fileSet>
                        <outputDirectory>/</outputDirectory>
                        <includes>
                            <include>src/main/samples/**</include>
                        </includes>
                    </fileSet>
                </fileSets>
            </sources>
        </moduleSet>
    </moduleSets>

</assembly>