FROM ubuntu:22.04

WORKDIR /opt/opendkim

RUN apt update && \
  apt upgrade -y && \
  apt install -y opendkim inetutils-syslogd curl

RUN curl -SsfL -o /usr/bin/gomplate "https://github.com/hairyhenderson/gomplate/releases/download/v3.11.5/gomplate_linux-amd64-slim" && \
  chmod 755 /usr/bin/gomplate && \
  mkdir -p /etc/rsyslog.d/ && \
  touch /etc/rsyslog.d/stdout.conf && \
  echo "*.*    /dev/stdout" > /etc/rsyslog.d/stdout.conf

COPY entrypoint.sh .
COPY opendkim.conf.tpl .

EXPOSE 8892/tcp
CMD ["/bin/bash", "entrypoint.sh"]