docs: document new output

Author: laughedelic

README.md

@@ -67,6 +67,10 @@ Once the snapshot of the dependencies has been submitted, GitHub responds with a
 
 The API URL of the submission created by the action. It can be queried to get the submitted snapshot.
 
+#### `snapshot-json-path`
+
+Path to the temporary JSON file with the dependency snapshot that has been submitted.
+
 #### Example
 
 ##### Excluding some projects or some Scala versions from the dependency submission.

action.yml

@@ -42,6 +42,8 @@ outputs:
     description: The ID of the submission created by the action
   submission-api-url:
     description: The URL of the submission created by the action
+  snapshot-json-path:
+    description: The path of the snapshot JSON file created by the action
 runs:
   using: 'node16'
   main: 'dist/index.js'