anchor.diff: -FROM ruby:2.4-alpine3.6
  +FROM ruby:2.7.6-alpine3.15
   
   LABEL maintainer="Johannes Schickling <schickling.j@gmail.com>"
   
  
positive.code:     && apk add --no-cache --virtual .build-deps \
          build-base \
          sqlite-dev \
      && gem install mailcatcher -v 0.8.0 --no-ri --no-rdoc \
      && apk del .build-deps
  
  ENV HTTPPATH="/"
  
negative.code: # webserver port
  EXPOSE 1080
  
  CMD ["sh", "-c", "mailcatcher --no-quit --foreground --ip=0.0.0.0 --http-path $HTTPPATH"]
  