feat: add vultr container registry resource

[im6h]

Description

• Based on Vultr API, add resource container registry and data container registry
• Add docs and examples to use the new resource

Checklist:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you linted your code locally prior to submission?
• Have you successfully ran tests with your changes locally?

[im6h]

I fixed golint and added resources to terrafrom code
@optik-aper Would you like to check it again? Thanks

[Stealthmate]

I'd really like to see this merged!
I'm in the process of writing TF manifests for all my stuff on Vultr, and container registry is one of the first things I need to have in order to bootstrap everything else.

I'm no Go expert, but I can hack on this and try to resolve the conflicts if needed.

[optik-aper]

Sorry for the delay! I'll test this out and merge it this afternoon.

[optik-aper]

This works for the most part. The tests aren't valid based on the requirements of the API, so that should be fixed. Some of the data schema isn't completely accurate either. Ideally this would include some documentation in the website/docs/r directory, but that can be added later.

A data_source for container registry would be nice to have, but not crucial to the basic functionality here. Another nice thing to have would be validation on the name field to ensure that the limited set of characters isn't allowed through. But neither of those are blockers for this PR.

[im6h]

I'd really like to see this merged! I'm in the process of writing TF manifests for all my stuff on Vultr, and container registry is one of the first things I need to have in order to bootstrap everything else.

I'm no Go expert, but I can hack on this and try to resolve the conflicts if needed.

Sure. I think we can make PR better before merging into the main

[F21]

Is there anything I can do to help with this one? Pretty keen to see this merged.

[optik-aper]

Is there anything I can do to help with this one? Pretty keen to see this merged.

I just tested things out and it's working. There are a few things I'd like to see cleaned up, and the name validation currently won't account for names with non-alphanumeric characters, but I will address that in a separate PR. I'll get a new release out today or tomorrow.

[optik-aper]

Approved with some updates to follow