feat(docker): Honor the host specified in current docker context

[rajiv-k]

Thanks for the great tool! ❤️

This patch adds support for detecting the "docker host" to connect to which is set in the current docker context. One can have multiple such contexts and one of them can be activated via docker context use <context-name>.

Fixes: #397 #412 #408

[reegnz]

@rajiv-k tests seem to be failing.

[rajiv-k]

@reegnz I had some time and wanted to look into the failing tests you mentioned. But it looks like the workflow needs approval now.

[jjmaestro]

I'd also love to get this patch merged, I think it'll be very useful to improve the usability of dive for e.g. Docker + Lima which usually sets up a separate Docker context and the "UX" for the average user without this patch is a pretty confusing failure when trying to fetch an image!

[rajiv-k]

Hi @wagoodman! Could you please take a look at this PR? I'd be happy to make any changes required.