Add docker client check before running tests that require docker

[feluelle]

Description

This change will make sure tests don't fail if docker is not installed

cc @slaarti

Changes

addresses: https://github.com/igorbenav/fastcrud/issues/110#issuecomment-2241901618

Checklist

• [x] I have read the CONTRIBUTING document.
• [x] My code follows the code style of this project.
• [x] I have added necessary documentation (if appropriate).
• [x] I have added tests that cover my changes (if applicable).
• [x] All new and existing tests passed.

[slaarti]

Ah, yes, good. This works for me. Thank you for looking into it!

[igorbenav]

Nice one, thanks!