Merge pull request wsargent#168 from michael-k/patch-1

Mention `--chown` for `ADD`/`COPY`

Author: wsargent

README.md

@@ -363,7 +363,7 @@ Here are some common text editors and their syntax highlighting modules you coul
 * [EXPOSE](https://docs.docker.com/engine/reference/builder/#expose) informs Docker that the container listens on the specified network ports at runtime.  NOTE: does not actually make ports accessible.
 * [ENV](https://docs.docker.com/engine/reference/builder/#env) sets environment variable.
 * [ADD](https://docs.docker.com/engine/reference/builder/#add) copies new files, directories or remote file to container.  Invalidates caches. Avoid `ADD` and use `COPY` instead.
-* [COPY](https://docs.docker.com/engine/reference/builder/#copy) copies new files or directories to container.  Note that this only copies as root, so you have to chown manually regardless of your USER / WORKDIR setting, as same as `ADD`.  See <https://github.com/moby/moby/issues/30110>
+* [COPY](https://docs.docker.com/engine/reference/builder/#copy) copies new files or directories to container.  By default this copies as root regardless of the USER/WORKDIR settings.  Use `--chown=<user>:<group>` to give ownership to another user/group.  (Same for `ADD`.)
 * [ENTRYPOINT](https://docs.docker.com/engine/reference/builder/#entrypoint) configures a container that will run as an executable.
 * [VOLUME](https://docs.docker.com/engine/reference/builder/#volume) creates a mount point for externally mounted volumes or other containers.
 * [USER](https://docs.docker.com/engine/reference/builder/#user) sets the user name for following RUN / CMD / ENTRYPOINT commands.