Updated Dockerfile

Also added instructions for building and deploying Docker image, and added docker directory with custom entrypoint

Dockerfile

@@ -1,8 +1,17 @@
-FROM ruby:2.3.1-alpine
+###
+# Build with 'docker build -t standard_notes_web.img .'
+# Run with 'docker run -d -p 127.0.0.1:3000:3000 --name standard_notes_web --restart always standard_notes.img'
+# If you need shell access, run 'docker exec -it standard_notes_web /bin/sh'
+# Access from http://localhost:3000/
+# Set up Nginx to terminate SSL with LetsEncrypt and proxy_pass to http://localhost:3000/
+###
+
+FROM ruby:alpine
 
 RUN apk add --update --no-cache \
     alpine-sdk \
     nodejs \
+    nodejs-npm \
     tzdata
 
 WORKDIR /app/
@@ -17,4 +26,10 @@ RUN npm install -g bower grunt
 
 RUN bundle exec rake bower:install
 
-RUN grunt
+RUN npm run build
+
+EXPOSE 3000
+
+ENTRYPOINT [ "./docker/entrypoint" ]
+
+CMD [ "start" ]