upgrade documentation and testing

[smira]

### Tasks
- [ ] https://github.com/siderolabs/omni/issues/512
- [ ] https://github.com/siderolabs/omni/issues/513

[github-actions]

This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 7 days.

[github-actions]

This issue was closed because it has been stalled for 7 days with no activity.