Dockerfile

FROM ruby:2.6.5-alpine

RUN apk add bash git openssh httpie libxml2-dev libxslt-dev postgresql-dev \
tzdata npm nodejs imagemagick make cmake g++ postgresql-client less

RUN npm install -g snowboard

ENV APP_USER app
ENV APP_USER_HOME /home/$APP_USER
ENV APP_HOME /home/www/boilerplate_rails_api

RUN adduser -D -h $APP_USER_HOME $APP_USER

RUN mkdir /var/www && \
   chown -R $APP_USER:$APP_USER /var/www && \
   chown -R $APP_USER $APP_USER_HOME

WORKDIR $APP_HOME

USER $APP_USER

COPY Gemfile Gemfile.lock .ruby-version ./

RUN gem i bundler -v $(tail -1 Gemfile.lock | tr -d ' ')

RUN bundle check || bundle install

COPY . .

USER root

RUN chown -R $APP_USER:$APP_USER "$APP_HOME/."

USER $APP_USER

CMD bundle exec puma -C config/puma.rb