public File write(File destDir) throws IOException {
        File target = new File(destDir,"Dockerfile");
        FileUtils.fileWrite(target, content());
        return target;
    }
Create a DockerFile in the given directory
@param  destDir directory where to store the dockerfile
@return the full path to the docker file
@throws IOException if writing fails
src/main/java/io/fabric8/maven/docker/assembly/DockerFileBuilder.java