modify Docker to run app in port 4000

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.3
+FROM ruby:2.5.3
 
 WORKDIR /opt
 RUN curl -Ls https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-2.1.1-linux-x86_64.tar.bz2 | tar -jxf -
@@ -8,8 +8,9 @@ RUN ln -s /opt/phantomjs-2.1.1-linux-x86_64/bin/phantomjs /usr/local/bin/
 WORKDIR /app
 ADD Gemfile* /app/
 RUN gem install bundler && bundle config build.nokogiri --use-system-libraries && bundle install --quiet --jobs 16 --retry 5 --without test
+RUN bundle install
 
 ADD . /app
 
-EXPOSE 3000
-CMD ["rails", "server", "-b", "0.0.0.0"]
+EXPOSE 4000
+CMD ["script/server"]

docker-compose.yml

@@ -2,22 +2,21 @@ version: "2"
 
 services:
   app:
-    image: wearefriday/spectre
     build: .
     ports:
-     - "3000:3000"
+     - "4000:4000"
     links:
      - db
     environment:
       - RAILS_ENV=production
       - RAILS_SERVE_STATIC_FILES=true
       - DATABASE_URL=postgresql://postgres@db/spectre
       - DOMAIN_NAME=app
-      - PORT=:3000
+      - PORT=:4000
       - PROTOCOL=http://
     volumes:
      - .:/app
-    command: bash -c "rm -f /app/tmp/pids/*.pid && rake assets:precompile && SECRET_KEY_BASE=`rake secret` rails server -b 0.0.0.0"
+    command: bash -c "rm -f /app/tmp/pids/*.pid && rake assets:precompile && SECRET_KEY_BASE=`rake secret` rails server -p 4000"
 
   db:
     image: postgres:9.6