linting

FROM debian:unstable

RUN apt-get update \
&&  apt-get install --no-install-recommends --no-install-suggests --yes \
    gir1.2-gdkpixbuf-2.0 \
    gir1.2-poppler-0.18 \
		gir1.2-rsvg-2.0 \
    pyflakes3 \
    pylint3 \
    python3-bandit \
    python3-gi-cairo \
    python3-mutagen \
    python3-pip \
&&  rm -rf /var/cache/apt/* /var/lib/apt/lists/* \
&&  pip3 install mypy