FROM ocaml/opam:alpine-ocaml-5.3 AS builder
WORKDIR /home/opam/src
COPY --chown=opam merry.opam .
RUN opam pin . -yn
RUN opam install . --deps-only --with-test
COPY --chown=opam . .
RUN opam exec -- dune build --profile=release

FROM ocaml/opam:alpine-ocaml-5.3  

# Copy across msh as the new shell!
COPY --from=builder /home/opam/src/_build/default/src/bin/main.exe /bin/msh 
RUN sudo ln -sf /bin/msh /bin/sh
SHELL [ "/bin/msh", "-c" ]
ENTRYPOINT [ "/bin/msh" ]