Merge pull request #21 from microservices-demo/docker/user

Added user to dockerfile.

Author: Phil Winder

docker/user/Dockerfile-release

@@ -1,4 +1,14 @@
-FROM busybox:1
+FROM alpine:3.4
+
+ENV	SERVICE_USER=myuser \
+	SERVICE_UID=10001 \
+	SERVICE_GROUP=mygroup \
+	SERVICE_GID=10001
+
+RUN	addgroup -g ${SERVICE_GID} ${SERVICE_GROUP} && \
+	adduser -g "${SERVICE_NAME} user" -D -H -G ${SERVICE_GROUP} -s /sbin/nologin -u ${SERVICE_UID} ${SERVICE_USER} && \
+	apk add --update libcap
+
 ENV HATEAOS user
 ENV USER_DATABASE mongodb
 ENV MONGO_HOST user-db
@@ -7,4 +17,10 @@ WORKDIR /
 EXPOSE 80
 COPY bin/user /
 
+RUN	chmod +x /user && \
+	chown -R ${SERVICE_USER}:${SERVICE_GROUP} /user && \
+	setcap 'cap_net_bind_service=+ep' /user
+
+USER ${SERVICE_USER}
+
 CMD ["/user", "-port=80"]