apt-get update \
&& apt-get -y upgrade \
&& apt-get -y install -q \
    build-essential \
    git \
    python3-dev \
    libffi-dev \
    libssl-dev \
    python3-setuptools \
    python3-pip \
    dumb-init \
    curl \
&& rm -rf /var/lib/apt/lists/* \
&& pip3 --no-cache-dir install 'twisted[tls]' \
&& mkdir /buildbot \
&& useradd -ms /bin/bash buildbot \
&& pip3 install buildbot-worker \
&& chown -R buildbot /buildbot