[QE] Setting KafkaChannel as default by config map should have an option to set via operator

[cardil]

It would be a good idea to have this code, capable to override the way the config map is applied. Currently, it's applying it directly, but when running under operator, that gets overwritten.

https://github.com/knative-sandbox/eventing-kafka/blob/f95e2c1c5fa237cef1389e8e64a53dbf93444979/test/upgrade/continual/channel.go#L244-L275

This prevented us to remove static configuration of default channel we have in https://github.com/openshift-knative/serverless-operator/blob/0b59eed02ce03ad382807af565fab33484a42e8d/hack/lib/serverless.bash#L219-L244 while running those tests in openshift-knative/serverless-operator#983 and openshift-knative/serverless-operator#1011. That's unfortunate as we can't test IMC in that way.

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[cardil]

/remove-lifecycle stale

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[pierDipi]

/remove-lifecycle stale
/triage accepted

[pierDipi]

/area test-and-release

[knative-prow-robot]

@pierDipi: The label(s) area/test-and-release cannot be applied, because the repository doesn't have them.

In response to this:

/area test-and-release

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