public String getCommand() {
    return Optional.ofNullable(get(ShellCommandConfig.COMMAND_SHELL_EXECUTE)).orElse("bin/run-container.sh");
  }
SamzaContainer uses JARs from the lib directory of the framework in it classpath. In some cases, it is necessary to include
the jars from lib directories of the resources that are localized along with the framework dependencies. These resources are logically
independent of the framework and cannot be bundled with the framework dependencies. The URI of these resources are set dynamically at
run-time before launching the SamzaContainer. This environment variable can be set to a lib directory of the localized resource and
it will be included in the java classpath of the SamzaContainer.
samza-core/src/main/java/org/apache/samza/config/ShellCommandConfig.java