fix(container-images): install uv as system package

[mudler]

Description

This PR fixes this error that is happening since today in our image builds:

0.089 Initializing libbackend for coqui
0.089 make: Leaving directory '/build/backend/python/coqui'
0.089 ./../common/libbackend.sh: line 91: uv: command not found
0.089 make: *** [Makefile:3: coqui] Error 127

Seems uv install changed default paths or something around that (didn't deep dive). It sounds anyway safe to install the package at system-level because it has no users and uv is supposed to be usable by all users in the system.

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