Fix basic authentication during schema registry init

[pvannierop]

Problem

During initialization of schema registry the following error was thrown:

[2024-03-19 17:47:28,574] INFO  - Initializing SchemaRegistration with authentication... (SchemaRegistryCommand.kt:98)
[2024-03-19 17:47:29,631] ERROR - Schema registry https://psrc-4kk0p.westeurope.azure.confluent.cloud not ready, responded with HTTP 401 Unauthorized: REST call to <https://psrc-4kk0p.westeurope.azure.confluent.cloud/subjects> failed (HTTP code 401 Unauthorized): {"error_code":401,"message":"Unauthorized"} (Emitters.kt:231)
[2024-03-19 17:47:29,633] INFO  - Waiting 1.321031400s seconds to retry (KafkaTopics.kt:303)

The cause was that basic authentication headers were not sent during init where the schema registry requests the /subjects endpoint.

Solution

A basic auth header was added so that the request succeeds.

Note

Basic auth headers appeared to be set at a global scale for the Ktor HttpClient. However, these do not appear to work for the /subjects call during init. To make sure we do not run into problems elsewhere I added the sendWithoutRequest param to the global HttpClient config (see docs).

[Bdegraaf1234]

Solves #368

Testing this on the dev server now :)

[Bdegraaf1234]

We should merge to dev, and see how to release this asap. 0.8.7-hotfix or 0.8.8?

[Bdegraaf1234]

Just some style fixes needed

[Bdegraaf1234]

I can't get the derived MorePlatform docker image to work unfortunately. This might be due to erroneous building, there is a script missing and I have seen it before.

> kt logs catalog-server-797f767db5-q29zd --container kafka-init 
exec /usr/bin/init.sh: no such file or directory

If you tested it locally I would be ok merging, releasing a hotfix from the dev branch and testing it that way