Manifest lists with manifests of different mediaType should be valid

[whatsacomputertho]

This is an observation made as resolving a previous bug

• Fails to pull a public image from: ghcr.io/matejvasek/builder-ubi8-base:latest #30 (comment)

If we get an OCI index back from the registry that contains docker v2 manifests, then we consider that an invalid schema. Other clients out there like skopeo do not impose such a heavy-handed check. We should soften this check and enable OCI indices to contain docker v2 manifests, and vice versa, docker v2s2 manifest lists to contain OCI manifests.

[whatsacomputertho]

FYI @cmoulliard @matejvasek

[whatsacomputertho]

Moved to in-progress as I plan to (hopefully) work on this today

[whatsacomputertho]

Moving out of in-progress as I didn't get to this during the weekend. I may get to it this week, we'll see how the work schedule pans out

[whatsacomputertho]

Moved back to in-progress. Working this now.

[whatsacomputertho]

@cmoulliard @matejvasek Here is the quick example now working with your ghcr.io image swapped in:

% python examples/quick-example.py
Size of ghcr.io/matejvasek/builder-ubi8-base:latest: 362.57 MB
Digest for ghcr.io/matejvasek/builder-ubi8-base:latest: sha256:701a398aa35bc8858f257eec8e0b8e3867b4f6abaec26f14d967aeb7a300b9a7

PR on its way soon for you to review.

[whatsacomputertho]

PR open now and passing all CI checks, ready for review

• fix(validation): do not enforce entry mediatypes #37

Moving this issue into review

[whatsacomputertho]

Going to go ahead and merge that PR now