Rename var

roles/matrix-base/defaults/main.yml

@@ -301,4 +301,4 @@ run_stop: true
 
 # Saves the git hash in a file called git_hash.yml 
 # Set this to false if GIT is not installed on the local system (the system where the ansible command is run on)
-git_save_hash: true
+matrix_playbook_commit_hash_preservation_enabled: true