Fix controller group in Alpine

Signed-off-by: Stefan Prodan <[email protected]>

Author: stefanprodan

Dockerfile

@@ -44,7 +44,7 @@ COPY --from=builder /workspace/source-controller /usr/local/bin/
 # https://github.com/gliderlabs/docker-alpine/issues/367#issuecomment-354316460
 RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf
 
-RUN addgroup -S controller && adduser -S -g controller controller
+RUN addgroup -S controller && adduser -S controller -G controller
 
 USER controller