set up the project by using docker

.gitignore

@@ -27,3 +27,6 @@
 # Ignore dist files
 /public/assets
 
+# Ignore env files
+*.env
+

Dockerfile

@@ -0,0 +1,19 @@
+FROM ruby:2.4.2-stretch
+RUN apt-get update -qq && apt-get install -y nodejs postgresql-client
+
+RUN mkdir /myapp
+WORKDIR /myapp
+COPY Gemfile /myapp/Gemfile
+COPY Gemfile.lock /myapp/Gemfile.lock
+RUN bundle install
+COPY . /myapp
+
+
+# Add a script to be executed every time the container starts.
+COPY entrypoint.sh /usr/bin/
+RUN chmod +x /usr/bin/entrypoint.sh
+ENTRYPOINT ["entrypoint.sh"]
+EXPOSE 3000
+
+# Start the main process.
+CMD ["rails", "server", "-b", "0.0.0.0"]

docker-compose.yml

@@ -0,0 +1,20 @@
+version: '3'
+services:
+  db:
+    image: postgres:9.5
+    volumes:
+      - ./tmp/db:/var/lib/postgresql/data
+    restart: always
+    env_file:
+      - db.env
+  web:
+    build: .
+    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'; env"
+    volumes:
+      - .:/myapp
+    ports:
+      - "3000:3000"
+    depends_on:
+      - db
+    env_file:
+      - app.env

entrypoint.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+set -e
+
+# Remove a potentially pre-existing server.pid for Rails.
+rm -f /myapp/tmp/pids/server.pid
+
+# Then exec the container's main process (what's set as CMD in the Dockerfile).
+exec "$@"