docs: public String content() throws IllegalArgumentException {
  
          StringBuilder b = new StringBuilder();
  
          DockerFileKeyword.FROM.addTo(b, baseImage != null ? baseImage : DockerAssemblyManager.DEFAULT_DATA_BASE_IMAGE);
          if (maintainer != null) {
              DockerFileKeyword.MAINTAINER.addTo(b, maintainer);
          }
  
          addOptimisation();
          addEnv(b);
          addLabels(b);
          addPorts(b);
  
          addCopy(b);
          addWorkdir(b);
          addShell(b);
          addRun(b);
          addVolumes(b);
  
          addHealthCheck(b);
  
          addCmd(b);
          addEntryPoint(b);
  
          addUser(b);
  
          return b.toString();
      }