Run as non-root and root group for OpenShift compatibility

See https://developers.redhat.com/blog/2020/10/26/adapting-docker-and-kubernetes-containers-to-run-on-red-hat-openshift-container-platform#group_ownership_and_file_permission

Author: amuraru

Dockerfile

@@ -30,9 +30,8 @@ RUN CGO_ENABLED=0 go build \
 FROM alpine:3.17
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=builder /app/bin/kminion /app/kminion
-RUN addgroup -S redpanda \
-    && adduser -S redpanda -G redpanda \
-    && chmod o+rx /app/kminion
-USER redpanda
+RUN chown -R 1001:0 /app/kminion \
+    && chmod -R g=u /app/kminion
+USER 1001
 
 ENTRYPOINT ["/app/kminion"]