Docker image that mimics ROOT's conda nightly builds (and reproduces their failing tests)

Dockerfile

FROM condaforge/linux-anvil-comp7:latest

WORKDIR /home/conda
RUN source /opt/conda/bin/activate && conda update -y --all && \
    conda create -n root-nightly -c conda-forge -c https://root.cern/download/conda-nightly/latest root-nightly cmake make git
RUN source /opt/conda/bin/activate && conda activate root-nightly && \
    git clone https://github.com/root-project/roottest.git && mkdir roottest_build && cd roottest_build && \
    cmake -DPYTHON_EXECUTABLE_Development_Main=$(which python) -Ddataframe=ON ../roottest && cmake --build . -- -j4