add: Python 3.8 multi-arch based on ubuntu 20.04

Author: inureyes

python/Dockerfile.3.8-ubuntu20.04

@@ -0,0 +1,76 @@
+FROM ubuntu:20.04
+# Ubuntu 20.04 comes with Python 3.8
+ENV DEBIAN_FRONTEND noninteractive
+RUN apt-get update && \
+    apt-get install -y \
+        ca-certificates apt-utils \
+        wget curl git-core \
+        vim-tiny zip unzip \
+        libssl-dev \
+        libmpdec2 \
+        proj-bin libproj-dev \
+        libgeos-dev libgeos++-dev \
+        mime-support \
+        gcc g++ \
+        cmake ncurses-term && \
+    ln -sf /usr/share/terminfo/x/xterm-color /usr/share/terminfo/x/xterm-256color && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/
+
+RUN apt-get update && \
+    apt-get install -y software-properties-common && \
+    add-apt-repository ppa:deadsnakes/ppa && \
+    apt-get update && \
+    apt-get install -y python3.8 python3.8-dev python3.8-distutils && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/
+
+RUN apt-get update && \
+    apt-get install -y libopenblas-dev && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/
+
+ENV PYTHONUNBUFFERED=1 \
+    PATH=/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \
+    LANG=C.UTF-8
+
+# Cartopy>=0.20 requires proj>=8.0.0 but it will ship on Ubuntu 22.04.
+RUN curl https://bootstrap.pypa.io/get-pip.py | python3.8 && \
+    python3.8 -m pip install --no-cache-dir -U setuptools && \
+    python3.8 -m pip install --no-cache-dir h5py && \
+    python3.8 -m pip install --no-cache-dir Cython && \
+    python3.8 -m pip install --no-cache-dir matplotlib bokeh && \
+    python3.8 -m pip install --no-cache-dir versioneer && \
+    python3.8 -m pip install --no-cache-dir pyproj cartopy==0.19.0.post1 && \
+    python3.8 -m pip install --no-cache-dir pandas && \
+    python3.8 -m pip install --no-cache-dir seaborn && \
+    python3.8 -m pip install --no-cache-dir pillow && \
+    python3.8 -m pip install --no-cache-dir networkx cvxpy && \
+    python3.8 -m pip install --no-cache-dir scikit-learn scikit-image && \
+    python3.8 -m pip install --no-cache-dir pygments && \
+    python3.8 -m pip install --no-cache-dir ipython && \
+    python3.8 -m pip install --no-cache-dir jupyter && \
+    python3.8 -m pip install --no-cache-dir jupyterlab && \
+    rm -rf /root/.cache && \
+    rm -f /tmp/*.whl
+RUN update-alternatives --install /usr/bin/python python /usr/bin/python3.8 2
+RUN update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 2
+
+# Install ipython kernelspec
+RUN python3.8 -m ipykernel install --display-name "Python 3.8 on Backend.AI" && \
+    cat /usr/local/share/jupyter/kernels/python3/kernel.json
+
+# Backend.AI specifics
+COPY ./service-defs /etc/backend.ai/service-defs
+LABEL ai.backend.kernelspec="1" \
+      ai.backend.envs.corecount="OPENBLAS_NUM_THREADS,OMP_NUM_THREADS,NPROC" \
+      ai.backend.features="batch query uid-match user-input" \
+      ai.backend.resource.min.cpu="1" \
+      ai.backend.resource.min.mem="256m" \
+      ai.backend.base-distro="ubuntu20.04" \
+      ai.backend.runtime-type="python" \
+      ai.backend.runtime-path="/usr/bin/python3" \
+      ai.backend.service-ports="ipython:pty:3000,jupyter:http:8070,jupyterlab:http:8090"
+COPY policy.yml /etc/backend.ai/jail/policy.yml
+
+# vim: ft=dockerfile