Docker file to create a rails application with ruby slim image

Dockerfile

FROM ruby:3.1.1-slim

WORKDIR /usr/src/app

RUN apt-get update && \
  apt-get install ruby-full build-essential -y && \
  apt-get install libpq-dev -y

COPY . .

RUN gem update --system

RUN bundle install

RUN if [ -f tmp/pids/server.pid ]; then rm tmp/pids/server.pid; fi 

EXPOSE 3000

ENTRYPOINT ["rails", "server", "-b", "0.0.0.0"]