Update PR auto-assignee workflow configuration

Changed 'required' property for 'assign_yourself' to false and added default values for 'assignees' and 'reviewers'.

Author: clouddrove-ci

.github/workflows/pr-auto-assignee.yml

@@ -8,14 +8,17 @@ on:
         description: 'A list of assignees(GitHub user name) to be added to PR'
         required: true
         type: string
+        default: true
       reviewers:
         description: 'A list of reviewers(GitHub user name) to be added to PRs'
         required: false
         type: string
+        default: true
       assign_yourself:
         description: 'Whether to assign the PR opener as an assignee'
-        required: true
+        required: false
         type: boolean
+        default: true
     secrets:
       GITHUB:
         description: 'Your GitHub token for authentication.'
@@ -45,4 +48,4 @@ jobs:
               issue_number: context.payload.pull_request.number,
               assignees:[ opener ] 
             });
-...
+...