Replace MAINTAINER with label

gleich · Byron · commit 80ac0fcf1b8e · 2020-01-22T11:04:46.000+08:00
diff --git a/Dockerfile b/Dockerfile
@@ -6,7 +6,10 @@
 #
 
 FROM ubuntu:xenial
-MAINTAINER James E. King III <jking@apache.org>
+
+# Metadata
+LABEL maintainer="jking@apache.org"
+
 ENV CONTAINER_USER=user
 ENV DEBIAN_FRONTEND noninteractive
 
