anchor.diff:      && apk add --no-cache --virtual .build-deps \
           build-base \
           sqlite-dev \
  -    && gem install mailcatcher -v 0.8.0 --no-ri --no-rdoc \
  +    && gem install mailcatcher -v 0.8.2 -N \
       && apk del .build-deps
   
   ENV HTTPPATH="/"
  
positive.code: FROM ruby:2.4-alpine3.6
  
  LABEL maintainer="Johannes Schickling <schickling.j@gmail.com>"
  
  
negative.code: # webserver port
  EXPOSE 1080
  
  CMD ["sh", "-c", "mailcatcher --no-quit --foreground --ip=0.0.0.0 --http-path $HTTPPATH"]
  