Check it fails

Author: istarkov

.github/actions/submodules-checkout/action.yml

@@ -6,7 +6,7 @@ description: |
 inputs:
   submodules-ssh-key:
     description: "The SSH key to private submodules to use for the checkout"
-    required: false
+    required: true
 
 runs:
   using: "composite"