Add docker support

Dockerfile

@@ -10,10 +10,4 @@ RUN mkdir -p $INSTALL_PATH
 
 WORKDIR $INSTALL_PATH
 
-COPY Gemfile Gemfile.lock ./
-
-COPY . .
-
-RUN bundle install --binstubs
-
-CMD puma -C config/puma.rb
+ENV BUNDLE_PATH /bundle

docker-compose.yml

@@ -2,18 +2,32 @@ version: '2'
 
 services:
   db:
+    restart: 'always'
     image: 'postgres:9.5'
     ports:
       - '5432:5432'
     volumes:
       - 'db:/var/lib/postgresql/data'
+
   app:
+    restart: 'always'
     depends_on:
       - 'db'
     build: .
     ports:
       - '3000:3000'
-    env_file: '.env'
+    volumes:
+      - '.:/test_track'
+    volumes_from:
+      - bundler_cache
+    command: ./script/serve
+    environment:
+      - DATABASE_URL=postgresql://postgres@db/test_track_development
+
+  bundler_cache:
+    image: busybox
+    volumes:
+      - /bundle
 
 volumes:
   db:

script/serve

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+echo "Checking for installed dependencies"
+bundle check || bundle install --binstubs
+
+echo "Starting Puma"
+bin/puma -C config/puma.rb