part-of-pom.xml

<plugin>
  <groupId>com.github.github</groupId>
  <artifactId>site-maven-plugin</artifactId>
  <version>0.11</version>
  <configuration>
    <!-- git commit message -->
    <message>${project.version}</message>
    <!-- disable webpage processing -->
    <noJekyll>true</noJekyll>
    <!-- matches distribution management repository url above -->
    <outputDirectory>${project.build.directory}/mvn-repo</outputDirectory>
    <!-- remote branch name -->
    <branch>refs/heads/mvn-repo</branch>
    <includes><include>**/*</include></includes>
    <!-- github repo name -->
    <repositoryName>GITHUB_REPO_NAME</repositoryName>
    <!-- github username  -->
    <repositoryOwner>GITHUB_USERNAME</repositoryOwner>
  </configuration>
  <executions>
    <!-- run site-maven-plugin's 'site' target as part of the build's normal 'deploy' phase -->
    <execution>
      <goals>
        <goal>site</goal>
      </goals>
      <phase>deploy</phase>
    </execution>
  </executions>
</plugin>