set working_dir

Author: nbbeeken

.evergreen/config.in.yml

@@ -111,6 +111,7 @@ functions:
   "perf send":
     - command: attach.artifacts
       params:
+        working_dir: src
         files:
           - ./test/benchmarks/driver_bench/results.json
     - command: subprocess.exec

.evergreen/config.yml

@@ -83,6 +83,7 @@ functions:
   perf send:
     - command: attach.artifacts
       params:
+        working_dir: src
         files:
           - ./test/benchmarks/driver_bench/results.json
     - command: subprocess.exec