support bootc-image-builder

[cgwalters]

https://gitlab.com/bootc-org/podman-bootc-cli/-/issues/26

Let's support a wrapper for https://github.com/osbuild/bootc-image-builder

This would first leverage CentOS/centos-bootc#453 to find the relevant image.

Also with this we should support being passed a config.

I'm envisioning:

podman-bootc run --via-bib

to start to do the disk image install that way to make it ergonomic to test. And that would happen automatically if passed podman-bootc run --image-config /path/to/config.json.

It'd also make sense to have
podman-bootc build-disk just be a direct wrapper for the podman run invocations for bib, allowing generic passthrough of everything there (e.g. could generate an ISO, qcow2 etc. without specifically running it)

[vrothberg]

I think a wrapper for building disk images would be a huge in improve in UX. I am incapable to recall all the flags required for building a disk image (via podman run --tons-of-flags).

One thing to think about is which BIB image podman bootc would use. Would it always use :latest or be tied to a specific release? There are pros and cons for both I guess. It would be great to have the image be configurable.

[cgwalters]

One thing to think about is which BIB image podman bootc would use

See CentOS/centos-bootc#453 which aimed to standardize this