Description of problem:

the workbench creation page allows users to set environment variables as ConfigMap by uploading a YAML file, but it doesn't support the same option for Secrets. 

Prerequisites (if any, like setup, operators/versions):

Create a DS project

Steps to Reproduce

1. Access your DS project from Dashboard UI
2. click "create workbench" button
3. try adding a new env variables as a Secret
4. check the option you have

Actual results:

users can set environment variables as a Secret by inserting key/value pairs (either basic kv pairs or AWS S3), but not by uploading a YAML file

Expected results:

users can set environment variables as Secret by upload a YAML file

Reproducibility (Always/Intermittent/Only Once):

Always

Build Details:

RHODS v1.19.0-14

Workaround:

Additional info: