Refactor environment variable handling using ConfigMap
- Refactored the code to use a ConfigMap for environment variables.
- Updated the `AUTH_TYPE` value in multiple deployment files to be fetched from the `env-configmap`.
- Updated the `DOMAIN` value in the nginx service deployment file to be fetched from the `env-configmap`.
- Updated the `INTERNAL_URL` value in the web server service deployment file to be fetched from the `env-configmap`.
