setup none-root user in final image stage

.dockerignore

@@ -0,0 +1,3 @@
+dist
+Dockerfile
+*.md

Dockerfile

@@ -1,13 +1,13 @@
 FROM golang:1.13.1 as build
-RUN groupadd -g 1000 1000 && \
-    useradd -r -u 1000 -g 1000 1000
 ADD . /app
-RUN chown 1000 app
 WORKDIR /app
 
 RUN CGO_ENABLED=0 GOOS=linux go build -ldflags '-extldflags "-static"'
 
 FROM alpine:3.10.1
 
+RUN addgroup --gid 1000 app && \
+    adduser --system --uid 1000 --ingroup app app
+USER app
+
 COPY --from=build /app/objinsync /bin/objinsync
-USER 1000