Add Mono yolk

Mono/Dockerfile

@@ -0,0 +1,11 @@
+FROM mono
+ENV DEBIAN_FRONTEND=noninteractive \
+    HOME=/home/container \
+    USER=container
+COPY entrypoint.sh /entrypoint.sh
+WORKDIR ${HOME}
+RUN apt-get update && apt-get upgrade -y && apt-get install -y --no-install-recommends iproute2 && \
+    useradd ${USER} -d ${HOME} && \
+    rm -rf /var/lib/apt/lists/*
+USER ${USER}
+ENTRYPOINT ["/bin/bash", "/entrypoint.sh"]