ARG DEBIAN_VERSION=buster-slim
FROM debian:${DEBIAN_VERSION}
ARG CONFD_VERSION=0.16.0
ADD https://github.com/kelseyhightower/confd/releases/download/v${CONFD_VERSION}/confd-${CONFD_VERSION}-linux-amd64 /usr/local/bin/confd
RUN mkdir -p /start.d \
  && printf '#!/bin/bash\nset -e\n/usr/local/bin/confd -onetime -backend env\nfind /start.d -maxdepth 1 -type f -exec cmd option {} \;\nexec ${@}\n' > /entrypoint.sh \
  && mkdir -p /etc/confd/conf.d /etc/confd/templates \
  && chmod +x /usr/local/bin/confd /entrypoint.sh
ENTRYPOINT ["/entrypoint.sh"]