-RUN echo 'deb http://deb.debian.org/debian/ sid main' \
- > /etc/apt/sources.list.d/sid.list
-RUN echo 'deb http://deb.debian.org/debian/ stretch-backports main' \
- > /etc/apt/sources.list.d/stretchbackports.list
-RUN echo '\nPackage: libtest-postgresql-perl\nPin: release a=unstable\nPin-Priority: 500\n\n'\
- > /etc/apt/preferences
-RUN echo '\nPackage: *\nPin: release a=unstable\nPin-Priority: 1\n\n'\
- >> /etc/apt/preferences
-RUN echo '\nPackage: *\nPin: release a=stretch-backports\nPin-Priority: 500\n\n'\
- >> /etc/apt/preferences