tools: do not run major-release workflow on forks

PR-URL: nodejs#57064
Reviewed-By: Jordan Harband <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: Trott

.github/workflows/major-release.yml

@@ -9,6 +9,7 @@ permissions:
 
 jobs:
   create-issue:
+    if: github.repository == 'nodejs/node'
     runs-on: ubuntu-latest
     permissions:
       issues: write