First apptainer .def file

doc/apptainer/README.md

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+# Install Fluidsim from source in a Apptainer container
+
+## Build the image locally on a node
+
+```sh
+apptainer build image-fluidsim.sif image-fluidsim.def
+```
+
+## Run the image to install Fluidsim from source
+
+From the host:
+
+```sh
+mkdir -p ~/apptainer_dir/home
+apptainer shell --no-home image-fluidsim.sif
+```
+
+From the container:
+
+```sh
+export HOME=$HOME/apptainer_dir/home
+```

doc/apptainer/image-fluidsim.def

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+BootStrap: docker
+From: python:3.11
+
+%post
+   apt-get -y update
+   apt-get -y install mercurial git less meld
+
+   apt-get install -y --no-install-recommends \
+     libfftw3-dev libfftw3-mpi-dev openmpi-bin libhdf5-openmpi-dev libopenblas-dev
+
+   export PATH=/root/.local/bin:$PATH
+   python -m pip install pipx
+
+   pipx install mercurial
+   pipx inject mercurial hg-git hg-evolve hg-fluiddyn
+
+   pipx install pdm
+   pipx install nox
+
+%environment
+   export LC_ALL=C
+   export PATH=/root/.local/bin:$PATH
+
+# %runscript
+
+%labels
+   Author Pierre Augier