buildroot: support list of spec files to builddep

[jlebon]

For rpm-ostree, we keep the canonical spec file upstream. Use that
instead of the latest deps of the last release since it's going to be
more up to date.

[cgwalters]

One thing is that if we grow a lot of these "curl stuff from the internets" it harms build reproducibility.

Man...this modulemd thing not being parallel installable is a chunk of sand in our CI pipeline, and will also be very annoying if we need to work on both old/new rpm-ostree versions.

I'm tentatively OK with this though.

[jlebon]

ShellCheck appeased! ⬆️

Man...this modulemd thing not being parallel installable is a chunk of sand in our CI pipeline, and will also be very annoying if we need to work on both old/new rpm-ostree versions.

Yeah, it's unfortunate. :(

Re. reproducibility, I think it's a legitimate concern, though the build process we have now is already far from reproducible. One idea we've floated around before would be to use lockfiles for cosa itself, though I'm not sure if it's quite worth the complexity.

[cgwalters]

/lgtm

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