Dockerfile for installing irmin-unix

Dockerfile

From ocaml/opam2
RUN sudo apt update
RUN sudo apt install -y m4 perl libgmp-dev pkg-config
RUN opam remote add upstream https://opam.ocaml.org && \
    opam update && opam upgrade
RUN git clone https://github.com/mirage/irmin
WORKDIR irmin
RUN opam pin add -k git -n irmin . && \
    opam pin add -k git -n irmin-unix . && \
    opam pin add -k git -n irmin-fs . && \
    opam pin add -k git -n irmin-mem . && \
    opam pin add -k git -n irmin-http . && \
    opam pin add -k git -n irmin-git . && \
    opam pin add -k git -n irmin-graphql .
RUN opam install irmin-unix