instance: add user_scheme param

[resmo]

Description

implements user_scheme handling for instances.

Related Issues

closes #96

Checklist:

• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• [x] Have you linted your code locally prior to submission?
• [x] Have you successfully ran tests with your changes locally?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (9f2dfc5) 89.37% compared to head (630ad79) 90.83%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #97 +/- ## ========================================== + Coverage 89.37% 90.83% +1.46% ========================================== Files 32 34 +2 Lines 969 1211 +242 Branches 164 185 +21 ========================================== + Hits 866 1100 +234 - Misses 45 52 +7 - Partials 58 59 +1 ```

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