Sven's comment above sums up why I migrated it. You're using a development tool, which is used much more frequently by SO folks than SF folks. So not only is your question off-topic here, but it stands a better chance of being answered there. So in that regard, you're in a better situation now than if your question was left here.
If you'd been asking about general docker engine use, from the command-line, on a Linux server, the question would be on-topic here.
I would like to address your below comment about this not being a development tool. To do so, I'll quote from Docker's website, emphasis mine:
Docker for Mac is an easy-to-install desktop app for building, debugging and testing Dockerized apps on a Mac. Docker for Mac is a complete development environment deeply integrated with the MacOS Hypervisor framework, networking and filesystem. Docker for Mac is the fastest and most reliable way to run Docker on a Mac.