ARG DEBIAN_VERSION=bullseye-slim
FROM golang:bookworm as confd
RUN apt-get update \
 && apt-get install -y \
    build-essential \
 && git clone https://github.com/kelseyhightower/confd.git \
 && cd confd \
 && make

FROM debian:${DEBIAN_VERSION}
COPY --from=confd /go/confd/bin/confd /usr/local/bin/confd
RUN mkdir -p /start.d \
  && printf '#!/bin/bash\nset -e\n/usr/local/bin/confd -onetime -backend env\nrun-parts -v /start.d\nexec ${@}\n' > /entrypoint.sh \
  && mkdir -p /etc/confd/conf.d /etc/confd/templates \
  && chmod +x /usr/local/bin/confd /entrypoint.sh
ENTRYPOINT ["/entrypoint.sh"]