Dockerfile snippet for debian package updates

Dockerfile

//Only for Ubuntu
//ENV DEBIAN_FRONTEND noninteractive

RUN /* apt-key adv --keyserver URL_HERE --recv-keys KEY_HERE && */ \
    /* echo 'deb URL_HERE trusty main' >> /etc/apt/sources.list && */ \
    apt-get update && \
    apt-get -yq install \
        curl \
        ...
    apt-get clean && \    
    rm -rf /var/lib/apt/lists/*