Ensure benchmark inputs are where benchmark executable can find them

Author: sergv

.github/workflows/haskell-ci.yaml

@@ -66,9 +66,12 @@ jobs:
     - name: Test
       run: |
         project_file="$(pwd)/cabal.project.test"
+        test_file="$(pwd)/test.txt"
+
         cd ../vector-quicksort-*/
         cabal run --project-file "$project_file" test -- --quickcheck-tests=100000 --quickcheck-max-size=1000
 
+        cp -v "$test_file" .
         cabal run --project-file "$project_file" bench -- --stdev 100 --timeout 600
 
     - name: Doctest