Add docs for using Nix flake

[Mic92]

Depends on https://github.com/rustfs/rustfs/pull/1096 for the flake itself.

Type of Change

• [ ] New Feature
• [ ] Bug Fix
• [x] Documentation
• [ ] Performance Improvement
• [ ] Test/CI
• [ ] Refactor
• [ ] Other:

Related Issues

Summary of Changes

Checklist

• [ ] I have read and followed the CONTRIBUTING.md guidelines
• [ ] Passed make pre-commit
• [ ] Added/updated necessary tests
• [ ] Documentation updated (if needed)
• [ ] CI/CD passed (if applicable)

Impact

• [ ] Breaking change (compatibility)
• [ ] Requires doc/config/deployment update
• [ ] Other impact:

Additional Notes

---

Thank you for your contribution! Please ensure your PR follows the community standards (CODE_OF_CONDUCT.md) and sign the CLA if this is your first contribution.

[loverustfs]

Sounds good.

If you're interested, go ahead and add yourself to the documentation as a NixOS RustFS contributor. You can let users know they can contact you directly for commercial support if they have issues with the integration.

Thank you. @Mic92

[loverustfs]

Hey @Mic92 ,

It's so cool. Merged. 👍

[loverustfs]

Thank you very much!