Reduce size of Ubuntu images

GitHub runners are limited to 7 GB of RAM, which limits docker image
sizes to at most 6.6 GB. Removing suggested packages saves 1.8 GB in
the Ubuntu 20.04 image.

docker/Dockerfile-rocm

@@ -2,8 +2,8 @@ ARG BASE_VERSION=3.3
 FROM rocm/dev-ubuntu-18.04:${BASE_VERSION}
 ENV DEBIAN_FRONTEND noninteractive
 COPY ubuntu-packages.txt /tmp
-RUN apt-get update && xargs -a /tmp/ubuntu-packages.txt apt-get install -y \
-    && apt-get install -y \
+RUN apt-get update && xargs -a /tmp/ubuntu-packages.txt apt-get install --no-install-recommends -y \
+    && apt-get install --no-install-recommends -y \
     rocrand rocfft rocthrust kmod \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*

docker/Dockerfile-ubuntu-18.04

@@ -2,8 +2,8 @@ FROM ubuntu:bionic
 ENV DEBIAN_FRONTEND noninteractive
 COPY build-and-install-scafacos.sh /tmp
 COPY ubuntu-packages.txt /tmp
-RUN apt-get update && xargs -a /tmp/ubuntu-packages.txt apt-get install -y \
-    && apt-get install -y \
+RUN apt-get update && xargs -a /tmp/ubuntu-packages.txt apt-get install --no-install-recommends -y \
+    && apt-get install --no-install-recommends -y \
     libthrust-dev \
     nvidia-cuda-toolkit \
     && apt-get clean && rm -rf /var/lib/apt/lists/*

docker/Dockerfile-ubuntu-20.04

@@ -2,8 +2,8 @@ FROM ubuntu:focal
 ENV DEBIAN_FRONTEND noninteractive
 COPY build-and-install-scafacos.sh /tmp
 COPY ubuntu-packages.txt /tmp
-RUN apt-get update && xargs -a /tmp/ubuntu-packages.txt apt-get install -y \
-    && apt-get install -y \
+RUN apt-get update && xargs -a /tmp/ubuntu-packages.txt apt-get install --no-install-recommends -y \
+    && apt-get install -y --no-install-recommends \
     clang-9 clang-tidy-9 clang-format-9 \
     doxygen \
     ffmpeg \

docker/Dockerfile-ubuntu-wo-dependencies

@@ -11,6 +11,7 @@ RUN apt-get update && apt-get install -y \
     git \
     libboost-dev libboost-serialization-dev libboost-mpi-dev libboost-filesystem-dev libboost-test-dev \
     libopenmpi-dev \
+    openssh-client \
     openmpi-bin \
     python3 \
     python3-numpy \

docker/ubuntu-packages.txt

 apt-utils
 autoconf
+automake
 build-essential
 ccache
 cmake
@@ -17,15 +18,18 @@ libgsl-dev
 libhdf5-openmpi-dev
 liblapack-dev
 libopenmpi-dev
+libtool
 openmpi-bin
 openssh-client
 pkg-config
 python3
+python3-dev
 python3-numpy
 python3-numpydoc
 python3-scipy
 python3-h5py
 python3-pip
+python3-lxml
 python3-requests 
 python3-setuptools
 python3-vtk7