chore(podman): add warning about subordinate ids

docker compositions/syncthing/docker-compose.osx.yml

@@ -1,6 +1,5 @@
 ---
 # Refer https://github.com/syncthing/syncthing/blob/main/README-Docker.md
-version: "3"
 services:
   syncthing:
     image: syncthing/syncthing:2.0.12
@@ -11,8 +10,9 @@ services:
       - PGID=20
       - STGUIADDRESS=0.0.0.0:8384
     volumes:
-      - config:/var/syncthing/config:z
+      - ${PWD}/config:/var/syncthing/config:z
       - ${PWD}/data:/var/syncthing/data
+      # - ${HOME}/media:/var/syncthing/media
     ports:
       # No way to use 'host' mode  in OS X
       - 127.0.0.1:8384:8384/tcp   # Web UI
@@ -25,5 +25,3 @@ services:
       interval: 1m
       timeout: 10s
       retries: 3
-volumes:
-  config: