FROM docker.io/debian:stable-slim

RUN apt-get update -y && apt-get install -y --no-install-recommends \
    ca-certificates git openssh-server

RUN addgroup --system --gid 10000 git
RUN adduser --system --uid 10000 --ingroup git --shell /usr/bin/git-shell --home /home/git git
RUN mkdir -p /var/run/sshd

COPY container/config /etc/ssh
COPY container/run-git-server /run-git-server

EXPOSE 22
CMD ["/run-git-server"]