Feat/add orc image

[jschoone]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• squash commits
• include documentation
• add unit tests

[jschoone]

Hi @garloff, this adds the ORC image, if you want to test that.
If that works we can build stable versions.
Unfortunately the images here currently don't match the SCS Standards

[berendt]

Unfortunately the images here currently don't match the SCS Standards

Why not? I was not previously aware that anything had to be changed there. Feel free to open a PR to improve the image to match the SCS standards again.

[garloff]

It's probably some of the metadata from https://docs.scs.community/standards/scs-0102-v1-image-metadata/ that's missing? The ORC should probably allow for these to be fed when registering the image. Properties can also be adjusted after registration, in case we need a postprocessing step.

Notes: scs-0102 only mandates things for provider-provided (public/community) images. So a customer using ORC to register images in her own tenant may ignore the settings. However, for efficiency having the cloud provider register the images makes a lot of sense, especially when using ceph's COW feature for raw images.

[berendt]

It's probably some of the metadata from https://docs.scs.community/standards/scs-0102-v1-image-metadata/ that's missing?

The metadata is only added when the image is uploaded. This has nothing to do with the content of the image itself.

[jschoone]

Versions are too old. Maybe this just needs to be merged?

[garloff]

/lgtm