Consider using multi-stage build for Conda based containers

[pditommaso]

It should be evaluated the sue of multi-stage build for Conda based containers. For example

FROM mambaorg/micromamba:1.5.10-noble 
COPY --chown=$MAMBA_USER:$MAMBA_USER conda.yml /tmp/conda.yml
RUN micromamba install -y -n base -f /tmp/conda.yml \
    && micromamba install -y -n base conda-forge::procps-ng \
    && micromamba env export --name base --explicit > environment.lock \
    && echo ">> CONDA_LOCK_START" \
    && cat environment.lock \
    && echo "<< CONDA_LOCK_END" \
    && micromamba clean -a -y
USER root

FROM ubuntu:noble
COPY --from=0 /opt/conda /opt/conda
USER root
ENV PATH="/opt/conda/bin:$PATH"

This would result in:

• slightly smaller container images
• ability to control the base image independently of the build image