Specify what "Checking Docker Engine" does on setup verification

[georgkrause]

I just setup unikube for the first time on a freshly installed Linux and run into the following problem. I guess this is mostly about documentation, maybe a little hint can be included when running unikube system verify.

Steps to reproduce

As a first note, I did installed unikube on a totally fresh Arch Linux, so no preparations were made. Follow the unikube install guide. This includes running unikube system verify, which reported an Error on "Checking Docker Engine".

Problem

It was not absolutely clear what is required.

Solution

In the end I had to add my user to the docker group and start the docker daemon. Naming the item "Checking Docker Engine is running" makes it more clear how to solve. Maybe its even possible to run the required commands, assume the user has systemd and display some more helpful information what is required when running unikube system install

[schwobaseggl]

We can definitely link to https://docs.docker.com/engine/install/linux-postinstall/#manage-docker-as-a-non-root-user in the documentation. I wonder if it is possible to include this automatically in system install or if it can be circumvented whe running system verify with sudo.