fix(docker): Re-order directory creation

Dockerfile-build

@@ -1,7 +1,5 @@
 FROM node:0.10.45
 
-WORKDIR /app
-
 RUN groupadd --gid 10001 app && \
     useradd --uid 10001 --gid 10001 --home /app --create-home app
 
@@ -11,6 +9,8 @@ RUN apt-get update && \
 
 USER app
 
+WORKDIR /app
+
 COPY scripts/check_gm.sh scripts/check_gm.sh
 COPY package.json package.json