Configure for Docker based development

This commit adds the necessary configuration and Docker related
files to allow the application and dependencies to run within Docker
containers. Utilizing docker-compose, this also allows the orchestration
of the separate database, cache, and jobs containers apart from the
main application.

Dockerfile

@@ -0,0 +1,17 @@
+FROM ruby:2.3.1
+
+RUN apt-get update -yqq \
+  && apt-get install -yqq --no-install-recommends \
+    postgresql-client \
+    nodejs \
+    qt5-default \
+    libqt5webkit5-dev \
+  && apt-get -q clean \
+  && rm -rf /var/lib/apt/lists
+
+WORKDIR /usr/src/app
+COPY Gemfile* ./
+RUN bundle install
+COPY . .
+
+CMD bundle exec unicorn -c ./config/unicorn.rb

config/secrets.yml

@@ -0,0 +1,8 @@
+development:
+  secret_key_base: <%= ENV["SECRET_KEY_BASE"] %>
+
+development:
+  secret_key_base: <%= ENV["SECRET_KEY_BASE"] %>
+
+production:
+  secret_key_base: <%= ENV["SECRET_KEY_BASE"] %>

docker-compose.yml

@@ -0,0 +1,36 @@
+version: "2"
+
+volumes:
+  db-data:
+    external: false
+
+services:
+  cache:
+    image: memcached:1.4-alpine
+
+  db:
+    environment:
+      POSTGRES_USER:
+      POSTGRES_PASSWORD:
+    image: postgres:9.5
+    volumes:
+      - db-data:/usr/local/pgsql/data
+
+  jobs:
+    env_file: .env
+    build: .
+    volumes:
+      - .:/usr/src/app
+    command: bundle exec rake jobs:work
+    depends_on:
+      - db
+
+  app:
+    env_file: .env
+    build: .
+    volumes:
+      - .:/usr/src/app
+    ports:
+      - "8080:8080"
+    depends_on:
+      - db

spec/spec_helper.rb

@@ -5,6 +5,9 @@
 
 ENV["RAILS_ENV"] = "test"
 
+require "dotenv"
+Dotenv.overload(".sample.env")
+
 require File.expand_path("../../config/environment", __FILE__)
 
 require "rspec/rails"