Fix user group for dockerfile

This fixes dockerfile template to set app group properly. Fixes
[openfaas#41](openfaas#41). Before
used to add GEO data for user, after the change adds group to user

Signed-off-by: Ivana Yovcheva (VMware) <[email protected]>

Author: ivanayov

template/dockerfile/function/Dockerfile

@@ -18,7 +18,7 @@ RUN apk --no-cache add curl \
 
 # Add non root user
 
-RUN addgroup -S app && adduser -S -g app app
+RUN addgroup -S app && adduser app -S -G app
 
 RUN chown app /home/app