[EPIC] Migrate official compliance tests to Zuul

[mbuechse]

PREREQUISITES:

• Increase granularity of badges or certification #660
• Compliance monitor: accept multiple reports in one yaml #715
• Compliance test: create simple end-user cli #716
• Compliance Monitor: use the same ssh key for all test subjects that run on our Zuul instance #664
• Compliance Monitor: test all subjects with but one Zuul job #665
• Reduce inter-template redundancy #738
• Drop redundant copying of checkout, run in pod #750

OPTIONAL:

• Compliance Monitor: add details page #671
• Compliance Monitor: allow reconfiguration without restart #666
• add notification mechanism to compliance monitor (or poll by some other service)

TASKS:

• write documentation for compliance tests via Zuul/compliance monitor
• mark GitHub actions as obsolete
• make sure templates in compliance monitor are up to date
• include generated table into docs page
• include link to generated table into README.md
• finally close Avoid duplication b/w standards/README.md and docs/standards/certification/overview.md docs#166

[martinmo]

Motivated by #680 (comment), are parallel checks against the same cloud coordinated in Zuul, so they don't interfere with each other?

[berendt]

@martinmo We have worked with semaphores on jobs that basically share the same project and have overlapping names. This prevents jobs from running in parallel on a shared project.

Semaphore definition: https://github.com/regiocloud/e2e-tests/blob/main/.zuul.yaml#L82-L84
Semaphore use: https://github.com/regiocloud/e2e-tests/blob/main/.zuul.yaml#L107-L108

[martinmo]

@berendt Thanks for the hint! It seems we do not currently use this here, at least a quick rg --hidden semaphore through the standards repo didn't reveal anything like that.

[mbuechse]

I don't think we have the case right now (the nightly jobs are not run in parallel as far as I can tell), but it would be good to be on the safe side nevertheless.

[mbuechse]

Discussed in today's (extraordinary) meeting of SIG Std/Cert: most new features are actually not needed for the switch and can be postponed.