new user in docker

Dockerfile

@@ -1,4 +1,8 @@
 ARG GO_VERSION=1.15.2
+ENV UID=998
+ENV GID=100
+ENV CONFIG=/config
+ENV DATA=/assets
 
 FROM golang:${GO_VERSION}-alpine AS builder
 
@@ -22,12 +26,17 @@ RUN mkdir -p /api
 WORKDIR /api
 COPY --from=builder /api/app .
 COPY client ./client
-RUN mkdir /config
-RUN mkdir /assets
-ENV CONFIG=/config
-ENV DATA=/assets
-RUN chmod 777 /assets; \
-    chmod 777 /config;
+RUN mkdir /config; \
+    mkdir /assets
+
+RUN  groupadd -g ${GID} poduser &&\
+    useradd -l -u ${UID} -g poduser poduser &&\
+    chown --changes --silent --no-dereference --recursive \
+           ${UID}:${GID} \
+        /assets \
+        /config 
+
+USER poduser
 
 EXPOSE 8080
 VOLUME ["/config", "/assets"]