add Jenkins tools "Ansible"

Jenkinsfile

@@ -1,5 +1,8 @@
 pipeline {
     agent any
+    tools {
+        ansible 'Ansible' 
+    }
     environment {
         SSH_ROOT_PASSWORD = credentials('ssh_root_password') 
         PSQL_PASSWORD = credentials('PSQL_pass') 

backup_postgresql.yml

@@ -4,7 +4,7 @@
     become: true
   
     vars:
-      backup_dir: "{{ backup_dir }}" #work
+      backup_dir: "{{ backup_dir }}" 
   
     tasks:
       - name: Create backup directory