Builds are broken due to a missing ruby dependency

[adejanovski]

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Builds started failing yesterday when installing fpm in the docker-build image:

150.8 ERROR:  Error installing fpm:
150.8 	The last version of dotenv (>= 0) to support your Ruby & RubyGems was 2.8.1. Try installing it with `gem install dotenv -v 2.8.1` and then running the current command again
150.8 	dotenv requires Ruby version >= 3.0. The current ruby version is 2.7.0.0.
150.8 Successfully installed stud-0.0.23
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Dockerfile:24
--------------------
  23 |     # install dependencies
  24 | >>> RUN apt-get update \
  25 | >>>     && apt-get install -y \
  26 | >>>         curl \
  27 | >>>     && curl -sL https://deb.nodesource.com/setup_10.x -o nodesource_setup.sh \
  28 | >>>     && bash nodesource_setup.sh \
  29 | >>>     && DEBIAN_FRONTEND="noninteractive" apt-get install -y \
  30 | >>>         build-essential \
  31 | >>>         git \
  32 | >>>         openjdk-8-jdk \
  33 | >>>         openjdk-11-jdk \
  34 | >>>         maven \
  35 | >>>         nodejs \
  36 | >>>         python2 \
  37 | >>>         rpm \
  38 | >>>         ruby-dev \
  39 | >>>     && mvn --version \
  40 | >>>     && gem install fpm \
  41 | >>>     && npm install -g bower
  42 |     
--------------------
ERROR: failed to solve: process "/bin/sh -c apt-get update     && apt-get install -y         curl     && curl -sL https://deb.nodesource.com/setup_10.x -o nodesource_setup.sh     && bash nodesource_setup.sh     && DEBIAN_FRONTEND=\"noninteractive\" apt-get install -y         build-essential         git         openjdk-8-jdk         openjdk-11-jdk         maven         nodejs         python2         rpm         ruby-dev     && mvn --version     && gem install fpm     && npm install -g bower" did not complete successfully: exit code: 1
Service 'build' failed to build : Build failed

Recommended fix above is to install dotenv explicitly using gem install dotenv -v 2.8.1