manage, add missing parenthesis.

bin/manage.sh

@@ -152,7 +152,7 @@ if [[ -n $up || -n $down || -n $build || -n $pull || -n $maintenance ]]; then
 
 		# Ensure env file exists so that all compose variables are populated.
 		if [[ -f "./example.env" && ! -f "./.env" \
-				&& ( -f "docker-compose.yml" || -f "compose.yml" ]]; then
+				&& ( -f "docker-compose.yml" || -f "compose.yml") ]]; then
 			echo "WARNING: .env file was not found, copying example as placeholder."
 			cp -v example.env .env
 		fi