Update Dockerfile for production environment to run with non-root user

[Kavignon]

Description

The application Dockerfile currently runs as the root user by default, a security risk in production environments. We must update the Dockerfile to follow best practices by creating and using a non-root user. This ensures the application runs with limited privileges, improving container security.

Tasks

• The Dockerfile runs the application under a non-root user in production.
• All files, dependencies, and build steps are accessible to the non-root user.
• The CMD successfully starts the application using the non-root user.
• The container image is tested to confirm proper functionality in production.