docs: simplify permissions for Dockerfile COPY (#27754)

mshavliuk · web-flow · commit 5fe61ca4aa8f · 2021-09-08T16:27:46.000+03:00
ref: https://docs.docker.com/engine/reference/builder/#copy
diff --git a/libbeat/docs/shared-docker.asciidoc b/libbeat/docs/shared-docker.asciidoc
@@ -294,10 +294,7 @@ ifeval::["{beatname_lc}"!="auditbeat"]
 ["source", "dockerfile", subs="attributes"]
 --------------------------------------------
 FROM {dockerimage}
-COPY {beatname_lc}.yml /usr/share/{beatname_lc}/{beatname_lc}.yml
-USER root
-RUN chown root:{beatname_lc} /usr/share/{beatname_lc}/{beatname_lc}.yml
-USER {beatname_lc}
+COPY --chown=root:{beatname_lc} {beatname_lc}.yml /usr/share/{beatname_lc}/{beatname_lc}.yml
 --------------------------------------------
 
 endif::[]
