Use fixed node image to eliminate side effects.

marcells · marcells · commit b4f9d3cd4f1b · 2017-03-21T01:41:21.000+01:00
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node
+FROM node:7.7.3-slim
 
 RUN npm install -g forever
 
