Dockerfile

FROM debian:buster-slim

# MAINTAINER Jo Shields <jo.shields@xamarin.com>
# MAINTAINER Alexander Köplinger <alkpli@microsoft.com>

ENV MONO_VERSION 6.12.0.107

RUN apt-get update \
  && apt-get install -y --no-install-recommends gnupg dirmngr \
  && rm -rf /var/lib/apt/lists/* \
  && export GNUPGHOME="$(mktemp -d)" \
  && gpg --batch --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF \
  && gpg --batch --export --armor 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF > /etc/apt/trusted.gpg.d/mono.gpg.asc \
  && gpgconf --kill all \
  && rm -rf "$GNUPGHOME" \
  && apt-key list | grep Xamarin \
  && apt-get purge -y --auto-remove gnupg dirmngr

RUN echo "deb http://download.mono-project.com/repo/debian stable-buster/snapshots/$MONO_VERSION main" > /etc/apt/sources.list.d/mono-official-stable.list \
  && apt-get update \
  && apt-get install -y mono-runtime \
  && rm -rf /var/lib/apt/lists/* /tmp/*