Dockerfile docker build speedup

gistfile1.txt

############################################################
# Speedup DPKG and don't use cache for packages
############################################################
# Taken from here: https://gist.github.com/kwk/55bb5b6a4b7457bef38d
#
# this forces dpkg not to call sync() after package extraction and speeds up
# install
RUN echo "force-unsafe-io" > /etc/dpkg/dpkg.cfg.d/02apt-speedup
#
# we don't need and apt cache in a container
RUN echo "Acquire::http {No-Cache=True;};" > /etc/apt/apt.conf.d/no-cache