public JibBuildRunner writeImageDigest(@Nullable Path imageDigestOutputPath) {
    this.imageDigestOutputPath = imageDigestOutputPath;
    return this;
  }
Set the location where the image digest will be saved. If {@code null} then digest is not
saved.

@param imageDigestOutputPath the location to write the image digest or {@code null} to skip
@return this
jib-plugins-common/src/main/java/com/google/cloud/tools/jib/plugins/common/JibBuildRunner.java