format justfile, safely integrate agru

justfile

@@ -4,8 +4,14 @@ default:
 
 # Pulls external Ansible roles
 roles:
+    #!/usr/bin/env bash
+    set -euo pipefail
+    if [ -x "$(command -v agru)" ]; then
+    	agru
+    else
     	rm -rf roles/galaxy
     	ansible-galaxy install -r requirements.yml -p roles/galaxy/ --force
+    fi
 
 # Runs ansible-lint against all roles in the playbook
 lint: