Add environments with Retro68 toolchain.

Retro68/universal/all/Dockerfile

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+FROM ubuntu:latest
+
+LABEL description="Retro68 cross compiler environment for m68k, PowerPC and Carbon development with the Apple Universal libraries."
+
+LABEL maintainer="claunia@claunia.com"
+
+RUN apt-get update; DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends gcc \
+  make libc6-dev build-essential libssl-dev libldap2-dev cmake libgmp-dev libmpfr-dev libmpc-dev \
+  libboost-all-dev bison flex texinfo ruby rsync tar python ssh git wget unzip adduser; \
+  apt-get autoremove -y; \
+  apt-get clean; \
+  rm /var/lib/apt/lists/* -r; \
+  rm -rf /usr/share/man/*
+
+RUN cd /tmp; \
+  git clone --recursive https://github.com/autc04/Retro68; \
+  cd /tmp/Retro68; \
+  wget https://macintoshgarden.org/sites/macintoshgarden.org/files/apps/InterfacesAndLibraries.zip; \
+  unzip InterfacesAndLibraries.zip; \
+  mv "Interfaces&Libraries"/* InterfacesAndLibraries/; \
+  mkdir -p /opt/Retro68; \
+  cd /opt/Retro68; \
+  /tmp/Retro68/build-toolchain.bash --clean-after-build --universal
+
+RUN adduser retro68 --disabled-password --gecos ""; \
+  sed -i "s|^#force_color_prompt=.*|force_color_prompt=yes|" /home/retro68/.bashrc; \
+  apt-get purge -y adduser passwd; \
+  apt-get autoremove -y; \
+  apt-get clean; \
+  rm /var/lib/apt/lists/* -r; \
+  rm -rf /usr/share/man/*
+
+RUN ( \
+    echo 'LogLevel DEBUG2'; \
+    echo 'PermitRootLogin yes'; \
+    echo 'PasswordAuthentication yes'; \
+    echo 'Subsystem sftp /usr/lib/openssh/sftp-server'; \
+  ) > /etc/ssh/sshd_config_remote_dev \
+  && mkdir /run/sshd
+
+RUN echo 'export TERM="xterm"' >> /home/retro68/.bashrc
+
+CMD ["/usr/sbin/sshd" "-D" "-e" "-f" "/etc/ssh/sshd_config_remote_dev"]