Some small fixes

[benoit74]

Rationale

Fix #86 Fix #40

Changes

• fix issues in Alembic configuration regarding the use of isort instead of ruff
• use colors from dedicated scheme
• make log level customizable

[codecov[bot]]

Codecov Report

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

Comparison is base (2797a89) 100.00% compared to head (2cc93fc) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #87 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 36 37 +1 Lines 1070 1087 +17 Branches 200 202 +2 ========================================= + Hits 1070 1087 +17 ```

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