add miniconda file to gitignore

[selenabr]

• fixes #

Description (what might a Reviewer want to know)

• what methods did you move somewhere else (not written by yourself and therefore might not be related to the PR topic, this is no excuse for bad code!)

PR checklist

• main-branch has been merged into local branch to resolve conflicts
• tests and linter have passed AFTER local merge
• at least one other dev reviewed and approved
• documentation
• tests

[github-actions]

Coverage report

The coverage rate went from 71.42% to 71.42% ➡️
The branch rate is 64%.

None of the new lines are part of the tested code. Therefore, there is no coverage data about them.

[hendraet]

It might be nice to make this a bit more general because there are different files if you are using MacOS or other architectures than x86