Merge branch '1245-use-alpine-based-docker-images' into 'master'

Use NodeJS 10.x Alpine Linux image

Closes #1245

See merge request Isleward/isleward!402

Dockerfile

@@ -1,5 +1,5 @@
 # Base image on Node.js 10.x LTS (dubnium)
-FROM node:10
+FROM node:10-alpine
 
 # Create app directory
 WORKDIR /usr/src/isleward