public JavaContainerBuilder setAppRoot(String appRoot) {
    return setAppRoot(AbsoluteUnixPath.get(appRoot));
  }
Sets the app root of the container image (useful for building WAR containers).

@param appRoot the absolute path of the app on the container ({@code /app} by default)
@return this
jib-core/src/main/java/com/google/cloud/tools/jib/api/JavaContainerBuilder.java