add microdnf update (#9)

Signed-off-by: Song Song Li <[email protected]>

Author: songleo

Dockerfile.multi-stage

@@ -15,8 +15,11 @@ RUN git update-index --refresh; make build
 # -----------------------------------------------------------------------------
 
 FROM registry.access.redhat.com/ubi8/ubi-minimal:latest
+
 LABEL maintainer="The Thanos Authors"
 
+RUN microdnf update -y && microdnf clean all
+
 COPY --from=builder /go/bin/thanos /bin/thanos
 
 ENTRYPOINT [ "/bin/thanos" ]