apko publish doesn't take json file

[ckoehler]

Hi!

I am trying to follow along with the reproducibility instruction here, but can't reproduce (ahem) the results. I get these errors, which looks like it wants yaml and doesn't know what to do with the json:

Error: failed to build image components: failed to load image configuration: failed to parse image configuration: yaml: unmarshal errors:
  line 48: field options not found in type types.ImageConfiguration
  line 49: field os-release not found in type types.ImageConfiguration
2024/10/08 12:01:58 INFO error during command execution: failed to build image components: failed to load image configuration: failed to parse image configuration: yaml: unmarshal errors:
  line 48: field options not found in type types.ImageConfiguration
  line 49: field os-release not found in type types.ImageConfiguration

The usual apko files are yaml, so that makes sense, but wondering what I'm doing wrong. apko is version 0.19.1.

Thanks!