Add a note about HOME wrt wordpress:cli

wordpress/content.md

@@ -79,4 +79,4 @@ Mount the volume containing your themes or plugins to the proper directory; and
 
 See [the "Running as an arbitrary user" section of the `php` image documentation](https://hub.docker.com/_/php/).
 
-When running WP-CLI via the `cli` variants of this image, it is important to note that they're based on Alpine, and have a default `USER` of Alpine's `www-data`, whose UID is `82` (compared to the Debian-based WordPress variants whose default effective UID is `33`), so when running `%%IMAGE%%:cli` against an existing Debian-based WordPress install, something like `--user 33:33` is likely going to be necessary. See [docker-library/wordpress#256](https://github.com/docker-library/wordpress/issues/256) for more discussion around this.
+When running WP-CLI via the `cli` variants of this image, it is important to note that they're based on Alpine, and have a default `USER` of Alpine's `www-data`, whose UID is `82` (compared to the Debian-based WordPress variants whose default effective UID is `33`), so when running `%%IMAGE%%:cli` against an existing Debian-based WordPress install, something like `--user 33:33` is likely going to be necessary (possibly also something like `-e HOME=/tmp` depending on the `wp` command invoked and whether it tries to use `~/.wp-cli`). See [docker-library/wordpress#256](https://github.com/docker-library/wordpress/issues/256) for more discussion around this.