Add Docker configuration

[ci skip]

.dockerignore

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+.bundle
+.git
+config/database.yml
+config/site.yml
+coverage
+db/*.sqlite3
+doc
+features
+log
+public/assets
+test
+tmp

Dockerfile

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+FROM phusion/passenger-ruby22:0.9.18
+
+WORKDIR /home/app/tracks
+
+# Install gems
+COPY Gemfile Gemfile.lock ./
+RUN bundle install --without development test mysql therubyracer --jobs=3
+
+# Install and configure the app
+ENV RAILS_ENV=production
+ENV DATABASE_URL=sqlite3:/var/tracks/database.sqlite3
+RUN mkdir /var/tracks && chmod 777 /var/tracks
+RUN touch /var/tracks/database.sqlite3 && chown app.app /var/tracks/database.sqlite3
+COPY . ./
+COPY config/site.yml.tmpl /etc/tracks/config/site.yml
+RUN ln -sf /etc/tracks/config/site.yml config/site.yml
+RUN bundle exec rake assets:precompile
+RUN chown -R app.app .
+
+# Configure nginx
+RUN echo "env DATABASE_URL;" > /etc/nginx/main.d/env.conf
+RUN echo "\
+server {\n\
+    listen 80 default_server;\n\
+    server_name _;\n\
+    root /home/app/tracks/public;\n\
+    passenger_enabled on;\n\
+    passenger_user app;\n\
+    passenger_ruby /usr/bin/ruby2.2;\n\
+}" > /etc/nginx/sites-enabled/tracks.conf
+RUN rm /etc/nginx/sites-enabled/default
+RUN rm -f /etc/service/nginx/down
+
+# Migrate the database on startup
+RUN echo "#!/bin/sh\nbundle exec rake db:migrate" > /etc/my_init.d/90_tracks.sh
+RUN chmod +x /etc/my_init.d/90_tracks.sh
+
+VOLUME ["/etc/tracks", "/var/tracks"]
+
+# Default command for baseimage-docker
+CMD ["/sbin/my_init"]