CPBR-2163: cp-ksqldb-server docker image size reduction

[Prince Raheja (rahejaprince)]

This PR makes changes to cp-ksqldb-server docker image to reduce the size of the image.
Following changes are done to reduce the size

1. use of new base image cp-base-java which is not containing a lot of packages present today in cp-base-new. This new image also removes python, which means no cub/dub. To get around this, CPBR team has extended already written ub.go script in golang to support the requirements for this migration.
2. It uses a multi stage docker build for cp-ksqldb-server image. In first step, it follows the steps as followed today and adds 1 more stage of reducing the duplicate jars present in docker image with symlink to the first occurence found for that jar. In second stage, it just copies all files as it is to a ubi9-minimal docker image.

Testing for this has been done locally using docker-compose where 7.9.x-latest-ubi8 images are used for kafka and schema-registry. As there hasn't been any successful docker build for master branch, CI tests are going to fail until there is a green build for CP docker image pipeline.

[sonarqube-confluent]

Analysis Details

1 Issue

• 0 Bugs
• 0 Vulnerabilities
• 1 Code Smell

Coverage and Duplications

• No coverage information (0.00% Estimated after merge)
• No duplication information (0.00% Estimated after merge)

Project ID: ksql-images

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