Pdf diff upload with sha in filename

Author: TheNetAdmin

.github/workflows/build_test.yml

@@ -120,7 +120,7 @@ jobs:
         if: ${{ always() }}
         uses: actions/upload-artifact@v1
         with:
-          name: pdf-diff
+          name: pdf-diff-${{ github.sha }}
           path: diff
 
   overleaf_update: