Add container/HAProxy tip to README

README.md

@@ -11,3 +11,8 @@ cd ha-handler/
 mix deps.get
 iex -S mix
 ```
+
+Tip: you can use containers to run the various external components of the HA
+setup locally without tainting your system. e.g.
+
+* `podman run -it --rm --network=host --mount type=bind,src=local_haproxy_conf_folder/,target=/usr/local/etc/haproxy haproxy:2.2.20-alpine3.15`