Reduce exit sleep in tests run with race detector to zero (#820)

Reduce exit sleep in tests run with race detector to zero
to make the tests run faster.

.github/workflows/go-test.yml

@@ -3,7 +3,7 @@ name: Go Test
 on:
   pull_request:
   push:
-    branches: ["main"]
+    branches: [ "main" ]
   workflow_dispatch:
   merge_group:
 
@@ -14,6 +14,11 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.event_name == 'push' && github.sha || github.ref }}
   cancel-in-progress: true
 
+env:
+  # Speed-up tests run with race detector by reducing default exit sleep of 1 s to 0.
+  # See: https://go.dev/doc/articles/race_detector#Options
+  GORACE: atexit_sleep_ms=0
+
 jobs:
   go-test:
     uses: filecoin-project/unified-github-workflows/.github/workflows/[email protected]