Generate serverless webhook CA as part of serverless manager logic

[dbadura]

Description
Make serverless manager responsible for certificate generation for serverless webhook.
Currently the cert is generated by the webhook itself.

AC

• serverless-manager generated certificate for https communication with webhook
• when certificate is about to expire the manager regenerated the certificate and makes sure it is consumed by all involved parties (serverless controller and webhook )

Think of the transition phase - serverless can still be installed by the previous installer (not via its manager).
Make sure that in such scenario the webhook will still have the certificate and will remain functional.

Reason
Clean separation od roles of serverless components

Attachment
Concept
Proposal
Cert generating library

[kwiatekus]

We should familiarise with the concept
https://github.com/kyma-project/community/tree/main/concepts/admission-webhook-cert-management that prefers a small cert generation library being used in the component operator instead of a separate cert-manager

[kyma-bot]

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[kwiatekus]

Please have a look at the cert reconciliation as part of BTP Manager

docs
PR

[kwiatekus]

As part of kyma-project/kyma#13631 we have introduced cert generation (and rotation ), but unfortunately when new cert secret is generated, the webhook itself is not restarted to pick it up... and only after restart the webhook can consume the newly generated certificate.

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/close

[kyma-bot]

@kyma-bot: Closing this issue.

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/close

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