wip: build-env: add a simplified build container

build-env/Dockerfile

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+FROM ubuntu:18.04
+
+ARG ZSDK_VERSION=0.11.2
+
+# install packages toolchain:
+ADD install-prereqs.sh /root/install-prereqs.sh
+RUN /root/install-prereqs.sh && rm /root/install-prereqs.sh
+
+ENV ZEPHYR_TOOLCHAIN_VARIANT=zephyr
+ENV ZEPHYR_SDK_INSTALL_DIR=/opt/toolchains/zephyr-sdk-${ZSDK_VERSION}
+ENV PKG_CONFIG_PATH=/usr/lib/i386-linux-gnu/pkgconfig
+
+WORKDIR /workdir

build-env/install-prereqs.sh

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+#!/usr/bin/env bash
+
+set -o errexit
+set -o pipefail
+set -o nounset
+
+ZSDK_VERSION=0.11.2
+
+# install prerequisite packages:
+dpkg --add-architecture i386
+
+apt-get update && apt-get upgrade -y
+
+DEBIAN_FRONTEND=noniteractive apt-get install -y --no-install-recommends \
+    ca-certificates \
+    ccache \
+    cmake \
+    device-tree-compiler \
+    dfu-util \
+    file \
+    gcc \
+    gcc-multilib \
+    git \
+    gnupg \
+    g++-multilib \
+    gperf \
+    libsdl2-dev \
+    make \
+    ninja-build \
+    python3-dev \
+    python3-pip \
+    python3-setuptools \
+    python3-tk \
+    python3-wheel \
+    wget \
+    xz-utils
+
+# install the latest CMake:
+wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | apt-key add -
+sh -c "echo 'deb https://apt.kitware.com/ubuntu/ bionic main' > /etc/apt/sources.list.d/cmake.list"
+
+apt update && apt-get install -y cmake
+
+# install west:
+pip3 install -U west
+
+# install Zephyr SDK:
+wget -q "https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v${ZSDK_VERSION}/zephyr-sdk-${ZSDK_VERSION}-setup.run" && \
+    sh "zephyr-sdk-${ZSDK_VERSION}-setup.run" --quiet -- -d /opt/toolchains/zephyr-sdk-${ZSDK_VERSION} && \
+    rm "zephyr-sdk-${ZSDK_VERSION}-setup.run"
+
+#
+# Grab any other python dependencies. TODO: should we pull a particular version, instead of master?
+#
+REQTS_URL="https://raw.githubusercontent.com/zephyrproject-rtos/zephyr/master/scripts"
+for file in requirements requirements-base requirements-build-test requirements-doc requirements-run-test requirements-extras
+do
+    wget -q "$REQTS_URL"/"$file".txt
+done
+
+pip3 install -r requirements.txt 
+
+for file in requirements requirements-base requirements-build-test requirements-doc requirements-run-test requirements-extras
+do
+    rm "$file".txt
+done