setup.sh: fix docker-compose — check for both plugin and standalone, install standalone docker-compose if plugin unavailable

deploy/setup.sh

@@ -41,10 +41,12 @@ if command -v docker &> /dev/null; then
   DOCKER_VERSION=$(docker --version 2>/dev/null | awk '{print $3}' | tr -d ',')
 fi
 
-# Check for docker-compose plugin
+# Check for docker-compose plugin OR standalone docker-compose
 COMPOSE_INSTALLED=false
 if docker compose version &> /dev/null; then
   COMPOSE_INSTALLED=true
+elif command -v docker-compose &> /dev/null; then
+  COMPOSE_INSTALLED=true
 fi
 
 # Check if repo already exists