[CI] Delete some more unneeded tools in GPU jobs

[giordano]

Ref #265.

[giordano]

Ok, maybe I'll avoid mounting all of root. Also, I have an idea to try and further (slightly) reduce the size of the Docker image

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[giordano]

Before

Filesystem     Type      Size  Used Avail Use% Mounted on
overlay        overlay   100G   86G   15G  86% /

After

Filesystem     Type      Size  Used Avail Use% Mounted on
overlay        overlay   100G   45G   56G  45% /

With the df commands at the end we should also be able to track how much space we still have at the end, and understand what partition is being filled.

Side note, every time we get a VM with a different software stack on the host, this is annoying 😩