[19] Merge remote-tracking branch 'chazlarson/patch-13' into nightly

Dockerfile

@@ -6,11 +6,11 @@ RUN echo "**** install system packages ****" \
  && apt-get update \
  && apt-get upgrade -y --no-install-recommends \
  && apt-get install -y tzdata --no-install-recommends \
- && apt-get install -y gcc g++ libxml2-dev libxslt-dev libz-dev libjpeg62-turbo-dev zlib1g-dev wget \
+ && apt-get install -y gcc g++ libxml2-dev libxslt-dev libz-dev libjpeg62-turbo-dev zlib1g-dev wget curl \
  && wget -O /tini https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini-"$(dpkg --print-architecture | awk -F- '{ print $NF }')" \
  && chmod +x /tini \
  && pip3 install --no-cache-dir --upgrade --requirement /requirements.txt \
- && apt-get --purge autoremove wget gcc g++ libxml2-dev libxslt-dev libz-dev -y \
+ && apt-get --purge autoremove gcc g++ libxml2-dev libxslt-dev libz-dev -y \
  && apt-get clean \
  && apt-get update \
  && apt-get check \