use registry for alias service

alias/Dockerfile

-FROM node:8
-WORKDIR /code
-
-RUN git clone https://github.com/MotieDesign101/iceBoxAlias.git/ /code
-RUN npm install
-
-CMD node alias.js 

alias/README

-run jake db:create to create database

docker-compose.yml

@@ -20,7 +20,7 @@ services:
     depends_on:
     - backend
   alias:
-    build: alias
+    image: registry.chaotikum.net/icebox/iceboxalias
     restart: always
     environment:
     - ICEBOX_DB_URL=postgresql://icebox:clubmate42@database/icebox