MP-1215 Use python image for python-base

docker/python-base/DockerfileUV

@@ -1,5 +1,6 @@
+ARG python_version
 # This stage is copied from mambaorg/micromamba Dockerfile and contains everything except the actual micromamba stuff
-FROM debian:12-slim AS preparation_stage
+FROM python:${python_version}-slim-bookworm AS preparation_stage
 RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates \
     && rm -rf /var/lib/apt/lists/*
 
@@ -47,14 +48,14 @@ RUN apt-get update -y \
 ADD https://astral.sh/uv/install.sh /uv-installer.sh
 RUN sh /uv-installer.sh && rm /uv-installer.sh
 ENV PATH="/root/.local/bin/:$PATH"
+# We use python base image so that we didn't have to run `uv run python` all the time
+# This version should be preferred
+ENV UV_PYTHON_PREFERENCE=system
 # Without this you will have to pass `--no-sync` for each `uv run` call, because it will try to install dev requirements otherwise
 ENV UV_NO_SYNC=true
 # Next two are needed, because otherwise uv cannot find certificates
 ENV UV_NATIVE_TLS=true
 ENV SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
-# Install python
-ARG python_version
-RUN uv python install --no-cache $python_version
 
 # Install runit-docker
 COPY --from=build_runit_docker /packages /packages