public DescriptorDigest getDigest() {
    return imageDigest;
  }
Gets the digest of the registry image manifest built by Jib. This digest can be used to fetch a
specific image from the registry in the form {@code myregistry/myimage@digest}.

@return the image digest
jib-core/src/main/java/com/google/cloud/tools/jib/api/JibContainer.java