Dockerfile

FROM debian:trixie-slim

### Envs
ENV USER_NAME="app" \
    PUID="911" \
    PGID="911"

RUN set -eux && \
    DEBIAN_FRONTEND=noninteractive apt-get update && \
    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends --no-install-suggests  \
        openssh-server \
        openssh-client \
        sudo \
        tini \
        moreutils \
        ca-certificates \
        tzdata \
        git \
        golang \
        curl \
        wget \
        netcat-traditional \
        nano \
        mc \
        zip \
        unzip && \
    apt-get -y autoremove && \
    apt-get clean && \
    rm -rf \
        /tmp/* \
        /var/lib/apt/lists/* \
        /var/tmp/* \
        /var/log/* \
        /usr/share/man && \
    touch /var/log/lastlog /var/log/faillog

COPY root/ /
RUN chmod +x /usr/local/bin/docker-entrypoint.sh

# User/Group
RUN set -eux && \
    useradd -u ${PUID} -U -d /app -m -s /bin/bash ${USER_NAME} && \
    usermod -G users ${USER_NAME} && \
    mkdir -p /app && \
    chown -R ${PUID}:${PGID} /app

ARG URL
ARG SOURCE
ARG BUILD_DATE
ARG AUTHORS
ARG VENDOR
ARG REVISION

# https://github.com/opencontainers/image-spec/blob/master/annotations.md
LABEL \
    "org.opencontainers.image.title"="Openssh" \
    "org.opencontainers.image.description"="Openssh" \
    "org.opencontainers.image.url"="$URL" \
    "org.opencontainers.image.source"="$SOURCE" \
    "org.opencontainers.image.version"="8.4" \
    "org.opencontainers.image.revision"="$REVISION" \
    "org.opencontainers.image.licenses"="MIT" \
    "org.opencontainers.image.created"="$BUILD_DATE" \
    "org.opencontainers.image.authors"="$AUTHORS" \
    "org.opencontainers.image.vendor"="$VENDOR" \
    "org.opencontainers.image.base.name"="debian:bookworm-slim" \
    "org.opencontainers.image.ref.name"="debian:bookworm-slim"

EXPOSE 2222
VOLUME /app

ENTRYPOINT ["/usr/bin/tini", "--", "/usr/local/bin/docker-entrypoint.sh"]
CMD ["/usr/sbin/sshd", "-D", "-e", "-f", "/app/sshd/sshd_config"]