Fix docker clean

[aittalam]

What's changing

make clean-docker-all breaks when no containers are running because the first command clean-docker-containers returns an error if the list of containers is empty.

This PR fixes that by using xargs to pass the list (when not empty) to docker rm and docker rmi.

Closes #660

How to test it

run make clean-all or make clean-docker-all. This should remove all containers + images if present, without breaking if there is none

Additional notes for reviewers

I am not sure why we'd need both make clean-all and make clean-docker-all. The semantics I had in mind was "clean-all should call clean-docker-all plus something else" but that does not happen (actually this is a subset of clean-docker-all). WDYT? Should we remove clean-all or is there a good reason to keep it (perhaps with a different name)?

• Tested the changes in a working environment to ensure they work as expected
• Added some tests for any new functionality
• Updated the documentation (both comments in code and product documentation under /docs)
• Checked if a (backend) DB migration step was required and included it if required

[aittalam]

Addressed reviews - with prune everything is neater, thank you!
Just a heads up that, differently from before, after this update we will not remove running containers which are hanging for some reason (or that one purposely left running).

Another warning: we are still removing ALL dangling containers and ALL images!
Many thanks @agpituk for raising this issue. For whoever will pick it up, the filter in the compose file works with containers but not with images, so we'll have to align on a way to do it (I'd be fine pruning only dangling images + lumigator's at this point).

[aittalam]

I added a commit with a possible solution for image removing:

• we run docker images "mzdotai/*" -q | xargs -n1 docker rmi -f to only remove our own images
• we run docker image prune to remove dangling images (useful for us because we generate tons of them)

WDYT @agpituk ?
Also please lmk if you have an answer to the question I raised in "Additional notes for reviewers" above

[agpituk]

I added a commit with a possible solution for image removing:

* we run `docker images "mzdotai/*" -q | xargs -n1 docker rmi -f` to only remove our own images

* we run `docker image prune` to remove dangling images (useful for us because we generate tons of them)

WDYT @agpituk ? Also please lmk if you have an answer to the question I raised in "Additional notes for reviewers" above

That works very well for me, thanks @aittalam !!

About the question, I agree, clean-all should call clean-docker-all plus additional stuff. Happy for this to be merged as it is or for you to also review that one.