add restart delay

Dockers/docker-watcher/version

@@ -0,0 +1 @@
+latest

Dockers/docker-watcher/watch.sh

@@ -4,6 +4,7 @@ set -eu
 WATCH_CONTAINER="${WATCH_CONTAINER:?set WATCH_CONTAINER to the container name or id to watch}"
 RESTART_CONTAINERS="${RESTART_CONTAINERS:?set RESTART_CONTAINERS to a comma-separated list of containers to restart}"
 POLL_INTERVAL="${POLL_INTERVAL:-30}"
+RESTART_DELAY="${RESTART_DELAY:-0}"
 
 # Only restart when status *becomes* unhealthy (avoids restarting every poll while still unhealthy).
 # Set RESTART_ON_EVERY_POLL=1 to restart on every poll while unhealthy.
@@ -27,6 +28,9 @@ restart_list() (
     else
       log "restart failed: $c"
     fi
+    if [ "$RESTART_DELAY" != "0" ]; then
+      sleep "$RESTART_DELAY"
+    fi
   done
 )