TCP option for the docker engine connection

[ivanilves]

I think the idea from @solidnerd PR #92 should be implemented.

[solidnerd]

I think one of low hanging fruit would be to use client.NewEnvClient() instead of the current implementation in https://github.com/ivanilves/lstags/blob/master/docker/client/client.go#L33 .

[vonrabbe]

@ivanilves I consider this critical.

❗ We need to have tcp for docker to preload images on our swarm fleet machines. 🙏

[vonrabbe]

I propose to do this first #29 and then immediately do the TCP thing.

WDYT?

[solidnerd]

@ivanilves @vonrabbe I would grab me this and try to solve it if you want. I think this would gives this tool a big improvement how you can handle that.
I think #94 is not the correct way because now we are skipping the tests during a docker build and this should be not case. When we are introducing the tcp option it's also possible to have the tests during the docker build and we can revert the assemble job in the makefile.

[ivanilves]

You are welcome to grab this @solidnerd 💪

Yes #94 is not the best way. We just needed something to start fast and simple.

[ivanilves]

Hey @solidnerd did you have any time to look at this?

[ivanilves]

Closing this in favor of #102 (to narrow focus)