CI: add race detector

.github/workflows/go.yml

@@ -1,4 +1,4 @@
-name: Build Status
+name: Test
 
 on: [push, pull_request]
 
@@ -13,6 +13,6 @@ jobs:
         with:
           go-version: '1.18'
       - name: Run coverage
-        run: go test -v -coverprofile=coverage.txt -covermode=atomic ./...
+        run: go test -race -v -coverprofile=coverage.txt -covermode=atomic ./...
       - name: Upload coverage to Codecov
         run: bash <(curl -s https://codecov.io/bash)