use flask way to manage config

[anshulagrawal2902]

Purpose of PR?:

Fixes #2506

Does this PR introduce a breaking change? No

If the changes in this PR are manually verified, list down the scenarios covered::

Additional information for reviewer? : Mention if this PR is part of any design or a continuation of previous PRs

Does this PR results in some Documentation changes? If yes, include the list of Documentation changes

Checklist:

• [ ] Bug fix. Fixes #
• [ ] New feature (Non-API breaking changes that adds functionality)
• [ ] PR Title follows the convention of <type>: <subject>
• [ ] Commit has unit tests

[ReimarBauer]

Welcome @anshulagrawal2902

Thx for working on this. Have a look on the failing tests.