Serverless webhook always crashes initially

[kwiatekus]

Description

Investigate why serverless webhook always crashes initially. After restart it works.
Also - it starts considerably long

Steps to reproduce

Deploy kyma cluster essentials:

kyma provision k3d
kyma deploy -s main --component cluster-essentials

Install serverless-manager

kubectl apply - f https://github.com/kyma-project/serverless-manager/releases/latest/download/serverless-manager.yaml

Apply sample serverless CR

kubectl apply - f https://raw.githubusercontent.com/kyma-project/serverless-manager/main/config/samples/operator_v1alpha1_serverless_k3d.yaml

Observe restart of webhook:

kubectl get pods -n kyma-system -w                                                                                                                                                                   NAME                                                     READY   STATUS    RESTARTS   AGE
serverless-manager-controller-manager-7ff5c47c69-7wwsd   2/2     Running   0          28s
serverless-ctrl-mngr-57b9466f65-rhr8r                    0/1     Running   0          9s
serverless-webhook-svc-558bdb78c6-bk88k                  0/1     Running   0          9s
serverless-webhook-svc-558bdb78c6-bk88k                  0/1     Error     0          13s
serverless-webhook-svc-558bdb78c6-bk88k                  0/1     Running   1 (1s ago)   14s

Error log

{"level":"ERROR","timestamp":"2023-03-22T08:41:24Z","caller":"webhook/main.go:107","message":"failed to read caBundle file: /tmp/k8s-webhook-server/serving-certs/server-cert.pem: open /tmp/k8s-webhook-server/serving-certs/server-cert.pem: no such file or directoryfailed to setup certificates and webhook secret","context":{}}

Attachment
Alternatively follow steps described in the scenario
https://killercoda.com/kyma-project/scenario/serverless

Related
Depends on #7

[pbochynski]

Actually it fails now permanently (at least on killercoda)
The function CRD from main doesn't work with the current release after this change:
kyma-project/kyma#17090

[kyma-bot]

This issue or PR has been automatically marked as stale due to the lack of recent activity.
Thank you for your contributions.

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/lifecycle stale

[kwiatekus]

Blocked because we want check if we need webhook at all
kyma-project/kyma#17562

[kyma-bot]

This issue or PR has been automatically marked as stale due to the lack of recent activity.
Thank you for your contributions.

This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 7d of inactivity since lifecycle/stale was applied, the issue is closed

You can:

• Mark this issue or PR as fresh with /remove-lifecycle stale
• Close this issue or PR with /close

If you think that I work incorrectly, kindly raise an issue with the problem.

/lifecycle stale

[kwiatekus]

Closing in favor of #247