Add .def file

singularity.def

+Bootstrap: docker
+From: python:3.9
+
+%environment
+export PYTHONPATH=.
+
+%files
+    ./setup.py
+    ./combo
+
+%post
+
+    # run dpkg (behind other tools like apt-get) without interactive dialogue
+
+    export DEBIAN_FRONTEND=noninteractive
+
+    apt-get -y update
+
+    apt-get -y install git ffmpeg virtualenv libopenmpi-dev openmpi-bin openmpi-common python3-pip python3-dev g++ gcc
+
+    # upgrade system pip, see: https://stackoverflow.com/a/49836753/7983111
+
+    apt-get -y install build-essential
+
+    python3 -m pip install --upgrade pip
+
+    # install python dependencies
+    #python3 -m pip install -r requirements.txt
+    #python3 -m pip install -r requirements_no_deps.txt --no-dependencies
+    python3 -m pip install .
+    python3 -m pip install protobuf
+    python3 -m spacy download en_core_web_sm
+
+%runscript
+    python3 -u ./combo/main.py "$@"