feat(TEE): publish signed images and prepare the needed certificates

[mudler]

Is your feature request related to a problem? Please describe.
Context in #563 #588

Describe the solution you'd like
This is a follow-up card to make sure we publish the signed binaries, container images, and prepare the needed certificates in the CI

Describe alternatives you've considered

Additional context

[mudler]

What is left for this card is QA

[mudler]

Closing as this is done. needs QA but we will experiment in devnet