Add spoc convert Command

[mhils]

What type of PR is this?

/kind bug
/kind feature

What this PR does / why we need it:

This command allows users to transform security profiles from a custom resource definition YAML to the raw profile as consumed by the respective security module. My primary use case here is testing AppArmor rules without dealing with Kubernetes, but it works for seccomp just as well.

Which issue(s) this PR fixes:

None

Does this PR have test?

Yes.

Special notes for your reviewer:

This PR first consolidates the code paths in artifact and merger to read YAML files (fixing ab bug in the artifact impl, see #2136 (comment)), and then reuses that for the convert functionality. It's probably easiest to review commits individually.

Happy to bikeshed on the name of the command if you feel convert is too generic. I hold no strong opinions. :)

Does this PR introduce a user-facing change?

Added a `spoc convert` command to transform security profile YAML definitions to their raw representation.

[k8s-ci-robot]

Hi @mhils. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[codecov-commenter]

Codecov Report

Merging #2201 (2833f00) into main (11d77f4) will decrease coverage by 4.37%.
Report is 141 commits behind head on main.
The diff coverage is 56.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2201      +/-   ##
==========================================
- Coverage   45.50%   41.14%   -4.37%     
==========================================
  Files          79      107      +28     
  Lines        7782    15529    +7747     
==========================================
+ Hits         3541     6389    +2848     
- Misses       4099     8670    +4571     
- Partials      142      470     +328     

[saschagrunert]

/ok-to-test

Thank you @mhils 🙏 !

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mhils, saschagrunert

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [saschagrunert]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment