[MISC] Fix: password-less runner auth with spread (#651)

Author: sinclert-canonical

spread.yaml

@@ -79,6 +79,8 @@ backends:
       PermitEmptyPasswords yes
       EOF
 
+      sudo passwd --delete "$USER"
+
       ADDRESS localhost
     # HACK: spread does not pass environment variables set on runner
     # Manually pass specific environment variables