feat(cert-manager): additional options for targeting WebhookConfigurations and CRDs

[bacherfl]

This PR adds the additional configuration option of strictly defining which Mutating/Validating Webhooks and CustomResourceDefinitions should be retrieved and extended with the generated certificate.
This can be done by using the following struct when creating a KeptnWebhookCertificateReconciler:

type ObservedObjects struct {
	MutatingWebhooks          []string
	ValidatingWebhooks        []string
	CustomResourceDefinitions []string
	Deployments               []string
}

type CertificateReconcilerConfig struct {
	WatchResources *ObservedObjects // if this is set, the controller will use the exact resources specified here, instead of using the label selector
	MatchLabels    labels.Set
	Namespace      string
	Log            logr.Logger
	Client         client.Client
	Scheme         *runtime.Scheme
	CancelMgrFunc  context.CancelFunc
}

This is intended for use cases where the KeptnWebhookCertificateReconciler will be used as a library in other operators. Using the newly introduced options, operators using this will not require get,list,update permissions for all WebhookConfigurations and CustomResourceDefinitions, but can rely on ClusterRoles giving them access to a strictly defined set of resources, specified by the resourceNames in the ClusterRoles

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[codecov]

Codecov Report

Merging #1276 (bd7d39c) into main (737d478) will increase coverage by 0.21%.
The diff coverage is 75.40%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1276      +/-   ##
==========================================
+ Coverage   61.22%   61.44%   +0.21%     
==========================================
  Files         138      143       +5     
  Lines       10471    10733     +262     
==========================================
+ Hits         6411     6595     +184     
- Misses       3807     3878      +71     
- Partials      253      260       +7     

Impacted Files	Coverage Δ
...llers/keptnwebhookcontroller/certificate_secret.go	86.04% <50.00%> (ø)
klt-cert-manager/pkg/certificates/watcher.go	59.74% <59.74%> (ø)
klt-cert-manager/eventfilter/eventfilter.go	44.44% <60.00%> (+19.44%)	⬆️
...okcontroller/keptnwebhookcertificate_controller.go	45.39% <65.38%> (+1.33%)	⬆️
klt-cert-manager/pkg/webhook/builder.go	83.78% <83.78%> (ø)
...llers/keptnwebhookcontroller/resource_retriever.go	86.95% <86.95%> (ø)
...ert-manager/pkg/certificates/certificatehandler.go	100.00% <100.00%> (ø)
klt-cert-manager/pkg/webhook/manager.go	100.00% <100.00%> (ø)

... and 6 files with indirect coverage changes

Flag	Coverage Δ
certificate-operator	68.55% <75.40%> (+4.26%)	⬆️
component-tests	59.87% <ø> (-0.29%)	⬇️
lifecycle-operator	82.48% <ø> (-0.05%)	⬇️
metrics-operator	77.90% <ø> (+0.09%)	⬆️
scheduler	21.75% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[odubajDT]

I guess you need to rebase to master to make the helm validation check to pass

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication