The maven getdown plugin to maven's build lifecycle to generate getdown's digest.txt file.
You need to make sure that there is a getdown.txt file copied to the target (or specified appdir) directory during the build process. Then setup the plugin as shown below:
<plugin>
<groupId>org.bitbucket.joxley</groupId>
<artifactId>getdown-maven-plugin</artifactId>
<version>0.0.1</version>
<configuration>
<appdir>target/app</appdir> <!-- Defaults to target -->
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>digest</goal>
</goals>
</execution>
</executions>
</plugin>