Integrate root database credentials with Helm chart deployment

[coderabbitai]

Context

PR #1655 introduces support for multiple database user credentials, specifically adding root user credentials (CLP_DB_ROOT_USER and CLP_DB_ROOT_PASS) to the database configuration. These new credentials are currently integrated into the Docker Compose deployment but need to be incorporated into the Helm chart deployment as well.

Related Work

• Feature request: Add support for deploying CLP to Kubernetes clusters using Helm charts. #1309
• Prototype: WIP - feat(deployment): Add k8s Helm chart for CLP package deployment. #1603
• Originating PR: feat(clp-package)!: Add support for multiple database user credentials; Use separate root database credentials. #1655

Task

Integrate the new root database credential environment variables (CLP_DB_ROOT_USER and CLP_DB_ROOT_PASS) into the Helm chart deployment configuration, ensuring consistency with the Docker Compose implementation.

Reference

This issue was created following discussion in PR #1655:
#1655 (comment)

Requested by: @junhaoliao