Crystal Devcontainer

Dockerfile

ARG VARIANT="20.04"
FROM mcr.microsoft.com/vscode/devcontainers/base:0-ubuntu${VARIANT}

RUN apt-get update && \
    apt-get install -y build-essential curl libevent-dev libssl-dev libxml2-dev libyaml-dev libgmp-dev git && \
    apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

RUN curl -sL "https://keybase.io/crystal/pgp_keys.asc" | apt-key add - && \
echo "deb https://dist.crystal-lang.org/apt crystal main" | tee /etc/apt/sources.list.d/crystal.list && \
apt-get update

RUN apt install -y crystal