RequestReply: Create InitContainer

[Cali0707]

Problem
Since the RequestReply resource needs a trigger to every pod, rather than to the deployment as a whole, we need to create an InitContainer which creates the trigger to the current pod. The trigger should look like:

apiVersion: eventing.knative.dev/v1
kind: Trigger
metadata:
  name: <generated name>
  namespace: <pod namespace>
spec:
  brokerRef: <brokerRef from the RequestReply resource>
  subscriber: <the RequestReply deployment>
  triggers:
    - cesql: "EXISTS <the name of the replyid for the RequestReply resource> AND KN_VERIFY_CORRELATION_ID(<the name of the replyid for the RequestReply resource>, <the secret names for the resource listed out>)"

Persona:
Which persona is this feature for?

Exit Criteria
A measurable (binary) test that would indicate that the problem has been resolved.

Time Estimate (optional):
How many developer-days do you think this may take to resolve?

Additional context (optional)
Add any other context about the feature request here.

• https://kubernetes.io/docs/concepts/workloads/pods/init-containers/
• https://stackoverflow.com/a/72218928
• Proposal: Request Reply Resource #7912

[chaliuu]

/assign

[Cali0707]

/triage accepted