Use arm32v6/node alpine base image

RandomByte · RandomByte · commit 7e78ab536078 · 2018-01-07T18:20:04.000+01:00
Image size reduction: 416MB -&gt; 155MB
diff --git a/Dockerfile.arm b/Dockerfile.arm
@@ -1,4 +1,4 @@
-FROM alexellis2/nodejs-armhf:6.9.2
+FROM arm32v6/node:9-alpine
 
 WORKDIR /app
 
