ARG ALPINE_VERSION=3.21
FROM alpine:${ALPINE_VERSION}

# Re-declare after FROM — build ARGs don't persist across FROM
ARG SUPERCRONIC_VERSION=0.2.33
ARG TARGETARCH

RUN apk add --no-cache docker-cli

ADD https://github.com/aptible/supercronic/releases/download/v${SUPERCRONIC_VERSION}/supercronic-linux-${TARGETARCH} \
    /usr/local/bin/supercronic
RUN chmod 755 /usr/local/bin/supercronic

# Match GID to your host's docker group. Check with: stat -c '%g' /var/run/docker.sock
ARG DOCKER_GID=999
RUN getent group ${DOCKER_GID} || addgroup -g ${DOCKER_GID} dockersock && \
    adduser -D -G $(getent group ${DOCKER_GID} | cut -d: -f1) cannibal

COPY entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh

USER cannibal

ENTRYPOINT ["/entrypoint.sh"]