ci: only trigger tag creation on github-actions PRs

Author: pvdrz

.github/workflows/create-tag.yml

@@ -7,7 +7,11 @@ on:
 
 jobs:
   create-tag:
-    if: github.event.pull_request.merged == true && github.event.pull_request.head.repo.full_name == github.event.pull_request.base.repo.full_name && startsWith(github.event.pull_request.head.ref, 'bump-version')
+    if: >-
+      github.event.pull_request.merged == true &&
+      github.event.pull_request.user.login == 'github-actions' &&
+      github.event.pull_request.head.repo.full_name == github.event.pull_request.base.repo.full_name &&
+      startsWith(github.event.pull_request.head.ref, 'bump-version')
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code