provisioning: Add getting started on Vultr tutorial

[dghubble]

• Add Provisioning Fedora CoreOS on Vultr docs that shows uploading a snapshot image and creating an instance using the vultr-cli
• Ignition config must include SSH authorized key setup

Related: coreos/fedora-coreos-tracker#355

[dghubble]

I don't typically create instances via CLI, but I did test it out for this using my Vultr image (hosted elsewhere, pending FCOS pipeline publishing) and a small Ignition config with just an SSH authorized key setup. It provisioned and I'm able to login (with cloud firewall rule added).

[dustymabe]

LGTM - a few questions for my education.

[jlebon]

We should probably hold this until it's actually downloadable from the getfedora.org page. (I added a corresponding checkbox in coreos/fedora-coreos-tracker#355).

[dustymabe]

We should probably hold this until it's actually downloadable from the getfedora.org page

agree.

Thanks @dghubble - we'll merge this when the next round of releases comes out.

[dustymabe]

hmm was just about to re-look at merging this but I still don't see vultr on the download page.

[dghubble]

Vultr images show up in meta.json, but it seems a few more pieces are missing coreos/fedora-coreos-tracker#355 (comment)

[lucab]

The website is now showing Vultr artifacts: https://getfedora.org/en/coreos/download?tab=cloud_operators&stream=stable.

[summatix]

Following the instructions here: https://docs.fedoraproject.org/en-US/fedora-coreos/provisioning-vultr/

I'm seeing the error: "Expected a raw disk image, but found: xz compressed data"

So the instructions may need to be updated a little (unless I'm misreading the instructions).

[lucab]

Ah yes, there is a decompress step missing. We can probably switch to use coreos-installer too, which can internally do the verify and decompress steps too.

[summatix]

I see in the Vultr panel there is a new "Fedora CoreOS" server type option that requests for ignition content. So it seems like the Vultr team have added native support for Fedora CoreOS already.

Update: I can confirm that Vultr's native Fedora CoreOS option is working as expected. I am able to provision FCOS 32 with custom ignition.