Add a build argument to nginx

Changes to the examples

Changes to complete the assignment

The Dockerfile

FROM debian:buster-slim

RUN apt-get update \
      && apt-get install -y nginx \
      && rm /var/log/nginx/access.log \
      && rm /var/log/nginx/error.log \
      && ln -s /dev/stdout /var/log/nginx/access.log \
      && ln -s /dev/stderr /var/log/nginx/error.log

CMD ["/usr/sbin/nginx", "-g", "daemon off;"]

Environment replacement

Docker Compose and environment variables