Add tutorial files.

.gitignore

@@ -65,3 +65,6 @@ yarn-debug.log*
 # Ignore uploaded files in development
 /storage/*
 !/storage/.keep
+
+# Ignore IJ IDE directory
+.idea

Dockerfile

@@ -0,0 +1,17 @@
+FROM ruby:2.5
+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"]

Gemfile

@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gem 'rails', '~>6'

Gemfile.lock

@@ -0,0 +1,10 @@
+GEM
+  specs:
+
+PLATFORMS
+  x64-mingw32
+
+DEPENDENCIES
+
+BUNDLED WITH
+   1.17.2

README.md

@@ -1,2 +1,10 @@
 # docker-compose-rails-skel
-Skeleton for the Docker ["Compose and Rails"](https://docs.docker.com/compose/rails/) tutorial
+This project is a skeleton for a rails app following ["Quickstart: Compose and Rails"](https://docs.docker.com/compose/rails/)
+
+From this sketch you can run the following commands to jump-start your app:
+```
+docker-compose run web rails new . --force --no-deps --database=postgresql
+sudo chown -R $USER:$USER . # Linux only
+docker-compose build
+```
+Now you should continue from ["Connect the database"](https://docs.docker.com/compose/rails/#connect-the-database) section of the tutorial

docker-compose-rails-skel.iml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="RUBY_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

docker-compose.yml

@@ -0,0 +1,17 @@
+version: '3'
+services:
+  db:
+    image: postgres
+    volumes:
+      - ./tmp/db:/var/lib/postgresql/data
+    environment:
+      POSTGRES_PASSWORD: password
+  web:
+    build: .
+    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
+    volumes:
+      - .:/myapp
+    ports:
+      - "3000:3000"
+    depends_on:
+      - db

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 "$@"