add Dockerfile and docker-compose.yml

.dockerignore

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+# git
+.git
+.gitignore
+README.md
+
+# Rails
+.env
+sample.env
+*.rbc
+capybara-*.html
+.rspec
+log
+tmp
+/db/**/*.sqlite3
+/db/**/*.sqlite3-journal
+/db/production
+public/system
+public/assets
+public/gl
+coverage/
+spec/tmp
+.rvmrc
+.byebug_history

Dockerfile

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+FROM ruby:2.5
+
+# Install app dependencies.
+RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs 
+
+# Set an environment variable for the install location.
+ENV RAILS_ROOT /usr/src/app
+
+# Make the directory and set as working.
+RUN mkdir -p $RAILS_ROOT
+WORKDIR $RAILS_ROOT
+
+# Set environment variables.
+ENV RAILS_ENV production
+
+# Adding project files.
+COPY . .
+
+# Install gems.
+RUN bundle install --without development test --deployment --clean
+
+# Precompile assets.
+RUN bundle exec rake assets:clean
+RUN bundle exec rake assets:precompile
+
+# Expose port 3000.
+EXPOSE 3000
+
+# Start the application.
+CMD ["bin/start"]

bin/start

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+#!/bin/bash
+
+bundle exec rake db:create
+bundle exec rake db:migrate
+
+exec bundle exec puma -C config/puma.rb

docker-compose.yml

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+version: '3'
+
+services:  
+  app:
+    entrypoint: [bin/start]
+    image: joshblind/greenlight:latest
+    container_name: greenlight-web
+    env_file: .env
+    restart: unless-stopped
+    ports:
+      - 6000:3000
+    volumes:      
+      - ./db/production:/usr/src/app/db/production
+      - ./log:/usr/src/app/log