Remove K8S_MEMBERSHIP_SCHEME_VERSION to Address Jackson-databind Vulnerabilities in Docker Images

[BimsaraBodaragama]

Purpose

This PR addresses the security vulnerabilities related to the jackson-databind library in the WSO2 Identity Server Docker images by removing K8S_MEMBERSHIP_SCHEME_VERSION.

Goals

Resolve the identified security vulnerabilities by eliminating the dependency on outdated versions of kubernetes-common.

Approach

1. Verified the vulnerability in versions 1.0.9 and 1.0.10 of kubernetes-common and identified that version 1.0.11 uses a secure jackson-databind version.
2. Cloned the wso2/docker-is repository and identified the usage of K8S_MEMBERSHIP_SCHEME_VERSION.
3. Removed the K8S_MEMBERSHIP_SCHEME_VERSION from relevant Dockerfiles.
4. Built and tested the updated Docker images in a Kubernetes environment to ensure no disruption in functionality.

Test environment

• JDK Versions: JDK 11
• Operating Systems: Ubuntu 20.04 (VM)
• Databases: MySQL
• Kubernetes: Minikube
• Browsers: Chrome

[bhagyasakalanka]

Have we test this locally? @BimsaraBodaragama

[BimsaraBodaragama]

Have we test this locally? @BimsaraBodaragama

Tested on Ubuntu.