Add provenance option

[kohkimakimoto]

Summary

This PR adds a provenance option in the builder config. You can use provenance: false to prevent the showing of unknown/unknown architecture on the container registry.

Description

I am using Kamal with GitHub Container Registry, and it works very well. However, when I push images to the container registry, I noticed an unknown/unknown architecture listed on the registry. See the screenshot below.

I believe this is an issue with the UI of the registry service, such as GitHub Container Registry. You can use provenance: false as a workaround to avoid the issue.

Once the PR is merged, you can use the following config to prevent pushing the unknown/unknown architecture.

builder:
  arch: amd64
  provenance: false

Related information

• https://github.com/orgs/community/discussions/45969
• Buildx 0.10.0 giving additional manifest to docker image? docker/buildx#1507

[Sija]

Suggested change

	argumentize "--provenance", provenance unless provenance.nil?
	argumentize "--provenance", provenance if provenance.present?

[kohkimakimoto]

This is intentional design, because if provenance is false, it should output the --provenance false option. It should only skip outputting --provenance … if provenance is nil.

[kohkimakimoto]

See also #838
It is a related discussion.

[lado936]

Any new on this? i am testing kamal for side project and this feature would be really helpful as right now in Gitlab CI, you cant check any info about image