ci: improve robustness of the "changes list" reusable workflow (#720)

Add a workaround to make it work when the workflow is called from
another repository.

### Notes 

Workaround found in
actions/checkout#692 (comment)
Tested in bonitasoft/bonita-labs-doc#160

.github/workflows/_reusable_pr-comment-list-changes.yml

@@ -46,3 +46,7 @@ jobs:
           pattern: ${{ inputs.pattern }}
           component-name: ${{ inputs.component-name }}
           doc-site-branch : ${{ inputs.doc-site-branch }}
+      - uses: actions/checkout@v4 # Ugly hack founds on https://github.com/actions/checkout/issues/692#issuecomment-1502203573
+        with:
+          repository: 'bonitasoft/bonita-documentation-site'
+          ref: ${{ inputs.doc-site-branch }}

.github/workflows/pr-comment-list-changes.yml

@@ -4,7 +4,7 @@ on:
   pull_request_target:
     paths:
       - '.github/actions/comment-pr-with-links/**/*'
-      - '.github/workflows/_reusable_pr-comment-list-changes'
+      - '.github/workflows/_reusable_pr-comment-list-changes.yml'
       - '.github/workflows/pr-comment-list-changes.yml'
 
 jobs: