infra: reduce RUNs in the base dockerfile

base/jobs/docker/1.0/py3/Dockerfile.cpu

@@ -10,11 +10,11 @@ LABEL major_version="1"
 ENV DEBIAN_FRONTEND noninteractive
 ENV DEBCONF_NONINTERACTIVE_SEEN true
 
-ENV PYTHONDONTWRITEBYTECODE=1
-ENV PYTHONUNBUFFERED=1
-ENV PYTHONIOENCODING=UTF-8
-ENV LANG=C.UTF-8
-ENV LC_ALL=C.UTF-8
+ENV PYTHONDONTWRITEBYTECODE=1 \
+ PYTHONUNBUFFERED=1 \
+ PYTHONIOENCODING=UTF-8 \
+ LANG=C.UTF-8 \
+ LC_ALL=C.UTF-8
 
 ARG PYTHON=python3.10
 ARG PYTHON_PIP=python3-pip
@@ -37,10 +37,9 @@ RUN apt-get update \
     zlib1g-dev \
     # Install dependent library for OpenCV
     libgtk2.0-dev \
- && rm -rf /var/lib/apt/lists/*
-
+ && rm -rf /var/lib/apt/lists/* \
 # Install Open MPI
-RUN mkdir /tmp/openmpi \
+ && mkdir /tmp/openmpi \
  && cd /tmp/openmpi \
  && curl -fSsL -O https://download.open-mpi.org/release/open-mpi/v4.0/openmpi-4.0.4.tar.gz \
  && tar zxf openmpi-4.0.4.tar.gz \
@@ -49,19 +48,17 @@ RUN mkdir /tmp/openmpi \
  && make -j $(nproc) all \
  && make install \
  && ldconfig \
- && rm -rf /tmp/openmpi
-
+ && rm -rf /tmp/openmpi \
 # Create a wrapper for OpenMPI to allow running as root by default
-RUN mv /usr/local/bin/mpirun /usr/local/bin/mpirun.real \
+ && mv /usr/local/bin/mpirun /usr/local/bin/mpirun.real \
  && echo '#!/bin/bash' > /usr/local/bin/mpirun \
  && echo 'mpirun.real --allow-run-as-root "$@"' >> /usr/local/bin/mpirun \
  && chmod a+x /usr/local/bin/mpirun
-
-RUN echo "hwloc_base_binding_policy = none" >> /usr/local/etc/openmpi-mca-params.conf \
+ && echo "hwloc_base_binding_policy = none" >> /usr/local/etc/openmpi-mca-params.conf \
  && echo "rmaps_base_mapping_policy = slot" >> /usr/local/etc/openmpi-mca-params.conf
 
-ENV LD_LIBRARY_PATH=/usr/local/openmpi/lib:/usr/local/lib:$LD_LIBRARY_PATH
-ENV PATH /usr/local/openmpi/bin/:$PATH
+ENV LD_LIBRARY_PATH=/usr/local/openmpi/lib:/usr/local/lib:$LD_LIBRARY_PATH \
+  PATH /usr/local/openmpi/bin/:$PATH
 
 # SSH login fix. Otherwise user is kicked off after login
 RUN sed 's@session\s*required\s*pam_loginuid.so@session optional pam_loginuid.so@g' -i /etc/pam.d/sshd
@@ -85,18 +82,17 @@ RUN apt-get update \
     libssl-dev \
     tk-dev \
  && rm -rf /var/lib/apt/lists/* \
- && apt-get clean
-
-# Installing Python3
-RUN wget https://www.python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tgz \
+ && apt-get clean \
+ # Installing Python3
+ && wget https://www.python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tgz \
  && tar -xvf Python-$PYTHON_VERSION.tgz \
  && cd Python-$PYTHON_VERSION \
  && ./configure && make && make install \
  && rm -rf ../Python-$PYTHON_VERSION*
 
 # Upgrading pip and creating symbolic link for python3
-RUN ${PIP} --no-cache-dir install --upgrade pip setuptools
-RUN ln -s $(which ${PYTHON}) /usr/local/bin/python \
+RUN ${PIP} --no-cache-dir install --upgrade pip setuptools \ 
+ && ln -s $(which ${PYTHON}) /usr/local/bin/python \
  && ln -s $(which ${PIP}) /usr/bin/pip
 
 WORKDIR /