reduced image size by 65%

.dockerignore

@@ -6,7 +6,7 @@ node_modules
 scripts
 !scripts/generateIntrospectionResult.js
 
-# documentation should not be visable in production.
+# documentation should not be visible in production.
 docs
 
 # static assets are rebuild in the docker container.

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:8
+FROM node:8-alpine
 
 # Create app directory
 RUN mkdir -p /usr/src/app