public static JibContainerBuilder from(RegistryImage registryImage) {
    return new JibContainerBuilder(registryImage);
  }
Starts building the container from a registry base image.

@param registryImage the {@link RegistryImage} that defines base container registry and
    credentials
@return a new {@link JibContainerBuilder} to continue building the container
jib-core/src/main/java/com/google/cloud/tools/jib/api/Jib.java