tools: skip test-shared workflow for draft PRs

PR-URL: #60365
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Chengzhong Wu <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

Author: targos

.github/workflows/test-shared.yml

@@ -36,6 +36,7 @@ permissions:
 
 jobs:
   build:
+    if: github.event.pull_request.draft == false
     strategy:
       fail-fast: false
       matrix: