Don’t persist the git directory from the Dawn source

Author: cuberoot

.github/workflows/dawn.yaml

@@ -44,7 +44,9 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: dawn-source
-          path: Dawn/dawn-source/
+          path: |
+            Dawn/dawn-source/
+            !Dawn/dawn-source/.git
           retention-days: 1
 
       - name: Read Dawn version