Updates check-cla workflow (#8368)

.github/workflows/cla-check.yml

@@ -1,13 +1,17 @@
 name: Check CLA Signature
 on:
-  pull_request:
+  pull_request_target:
     types:
       - opened
+      - reopened
+    paths-ignore:
+      - 'licenses/cla-individual.md'
 jobs:
   check_cla:
     runs-on: ubuntu-latest
     permissions:
       pull-requests: write
+    if: ${{ (github.event.pull_request.user.login != github.repository_owner) }}
     steps:
     - run: |
         if ! curl -s https://raw.githubusercontent.com/Jermolene/TiddlyWiki5/tiddlywiki-com/licenses/cla-individual.md | grep -o "@$USER,"; then
@@ -17,6 +21,7 @@ jobs:
           With apologies for the bureaucracy, please could you prepare a separate PR to the 'tiddlywiki-com' branch with your signature for the Contributor License Agreement (see [contributing.md](https://github.com/Jermolene/TiddlyWiki5/blob/master/contributing.md))."
         else
           echo "CLA already signed"
+          gh pr comment "$NUMBER" -b "**$USER** has signed the Contributor License Agreement (see [contributing.md](https://github.com/Jermolene/TiddlyWiki5/blob/master/contributing.md))"
         fi
       env:
         GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}