Docker build dependency?

I tried building ocis from the repo, but I found it strange that I need both docker and docker-compose as build dependencies. Why is this a hard build dependency when ocis can run without requiring docker? This prohibits running ocis on alternate operating systems.

No files, tests, or entry points are named. Start by inspecting the repository's build instructions and Docker/docker-compose dependency declarations, then trace why they are required and whether the project can build without them. Done means documenting the dependency rationale or confirming a build path that does not require Docker.

Written by the indexing model from the issue text.