Dockerfile
FROM ruby:2.6.3-alpine
RUN apk add --update --no-cache bash build-base nodejs sqlite-dev tzdata postgresql-dev yarn git
RUN gem install bundler:2.0.2
WORKDIR /usr/src/app
COPY package.json yarn.lock ./
RUN yarn install --check-files
COPY Gemfile* ./
RUN bundle install
COPY . .
ENV PATH=./bin:$PATH
CMD ["rails", "console"]