public static boolean useCrossRepositoryBlobMounts() {
    return System.getProperty(CROSS_REPOSITORY_BLOB_MOUNTS) == null
        || Boolean.getBoolean(CROSS_REPOSITORY_BLOB_MOUNTS);
  }
Gets whether or not to use <em>cross-repository blob mounts</em> when uploading image layers
({@code mount/from}). This is defined by the {@code jib.blobMounts} system property.

@return {@code true} if {@code mount/from} should be used, {@code false} if not, defaulting to
    {@code true}
jib-core/src/main/java/com/google/cloud/tools/jib/global/JibSystemProperties.java