Eventing TLS: Add transport-encryption feature flag

[pierDipi]

Problem
As the Eventing TLS feature track describes the feature track leverages a new config-features configuration called transport-encryption.

We should add:

• the new flag in https://github.com/knative/eventing/blob/main/config/core/configmaps/features.yaml with value disabled
• the new flag name in https://github.com/knative/eventing/blob/main/pkg/apis/feature/flag_names.go
• The additional possible flag values: [permissive, strict] in

  eventing/pkg/apis/feature/features.go

  Lines 30 to 36 in 7ba0648

  	// Enabled turns on an optional behavior.
  	Enabled Flag = "Enabled"
  	// Disabled turns off an optional behavior.
  	Disabled Flag = "Disabled"
  	// Allowed neither explicitly disables or enables a behavior.
  	// eg. allow a client to control behavior with an annotation or allow a new value through validation.
  	Allowed Flag = "Allowed"

• Helper methods like:
  func (e Flags) IsPermissiveTransportEncryption() bool and func (e Flags) IsStrictTransportEncryption() bool that would verify whether the transport-encryption feature flag has a specific value.

Time Estimate (optional):

1

Additional context (optional)

/good-first-issue

[knative-prow]

@pierDipi:
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Details

In response to this:

Problem
As the Eventing TLS feature track describes the feature track leverages a new config-features configuration called transport-encryption.

We should add:

• the new flag in https://github.com/knative/eventing/blob/main/config/core/configmaps/features.yaml with value disabled
• the new flag name in https://github.com/knative/eventing/blob/main/pkg/apis/feature/flag_names.go
• The additional possible flag values: [permissive, strict] in

  eventing/pkg/apis/feature/features.go

  Lines 30 to 36 in 7ba0648

  	// Enabled turns on an optional behavior.
  	Enabled Flag = "Enabled"
  	// Disabled turns off an optional behavior.
  	Disabled Flag = "Disabled"
  	// Allowed neither explicitly disables or enables a behavior.
  	// eg. allow a client to control behavior with an annotation or allow a new value through validation.
  	Allowed Flag = "Allowed"

• Helper methods like:
  func (e Flags) IsPermissiveTransportEncryption() bool and func (e Flags) IsStrictTransportEncryption() bool that would verify whether the transport-encryption feature flag has a specific value.

Time Estimate (optional):

1

Additional context (optional)

/good-first-issue

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[Rahul-Kumar-prog]

/assign