[Enhancement] Docker support Debugging (byebug & pry) and receive emails to MailHog via smtp (#371)

* updated development docker setup

* turned on yarn integrity check

* create test docker compose and update development dockerfile

* create docker Readme.md file

* fix README.md file

* create docker-copmose and dockerfile for production/staging environment setup

* added mailhog to catch email

* remove yarn integrity check in development mode!

* Update Readme.md file to support mailhog inbox

* update link to docker development guide from mail README

* remove .env.development and use .env.example for docker as .env.development was mixing with circleci config

* make the dockerfile configurable like before

* update docker-compose as per suggesion in PR

* create docker setup docs

* Revert accidental deletion

* fix: typo for branding consistency

* fix typo

* update the code as per recommendation in PR

* remove package-lock and add gitignore

* fix vulnerability AND update env for tests to pass

* Fix yarn integrity check across different docker services

* update code based on rubocop and PR suggestions

* remove redundant test docker-compose and dockerfile

* update rails entrypoint, update docs and Gemfile

* [Rubocop] order Gemfile alphabetically

* Reordering Gemfile

docker/Dockerfile

@@ -18,6 +18,7 @@ RUN apt-get update \
     git \
     imagemagick \
     libpq-dev \
+    postgresql-client \
     && curl -L https://deb.nodesource.com/setup_12.x | bash - \
     && curl https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
     && echo 'deb https://dl.yarnpkg.com/debian stable main' > /etc/apt/sources.list.d/yarn.list \
@@ -46,12 +47,4 @@ COPY . /app
 # generate production assets if production environment
 RUN if [ "$RAILS_ENV" = "production" ]; then \
   SECRET_KEY_BASE=precompile_placeholder bundle exec rake assets:precompile; \
-  fi
-
-# Add a script to be executed every time the container starts.
-COPY ./docker/entrypoint.sh /usr/bin/
-RUN chmod +x /usr/bin/entrypoint.sh
-ENTRYPOINT ["entrypoint.sh"]
-
-EXPOSE 3000
-CMD ["rails", "server", "-b", "0.0.0.0", "-p", "3000"]
+  fi