feat: make the nfs mount default to ro

ansible/group_vars/all

@@ -30,8 +30,8 @@
 # nfs_mounts related
   use_autofs: false
   mount_points:
-    - { "src": "master:/gpfs4", "path": "/gpfs4", "opts": "rw,sync,hard" }
-    - { "src": "master:/gpfs5", "path": "/gpfs5", "opts": "rw,sync,hard" }
+    - { "src": "master:/gpfs4", "path": "/gpfs4", "opts": "ro,sync,hard" }
+    - { "src": "master:/gpfs5", "path": "/gpfs5", "opts": "ro,sync,hard" }
 
 #SSH Host Keys
   S3_ENDPOINT: ""