[ci] add setuptools installation and pinning to the Dockerfile #779
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This is an alternative to #771 to solve #768: it involves installing setuptools and pinning its version directly in the Dockerfile, before the actual requirements get installed.
Background
Since
python:3.12.5-slim
,setuptools
is not pre-installed anymore, causing our builds to fail when using this (or later) images.See this comment for some background and details about the considered options, and why we did not choose to add setuptools to
requirements.in
.This PR also sets the base image to
python:3.12.6-slim
to show that the Dockerfile can be built.