Add goleak in unit tests

backend/internal/dnsproviders/dns_ad_test.go

@@ -5,9 +5,13 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"go.uber.org/goleak"
 )
 
 func TestAdProvider(t *testing.T) {
+	// goleak is used to detect goroutine leaks
+	defer goleak.VerifyNone(t, goleak.IgnoreAnyFunction("database/sql.(*DB).connectionOpener"))
+
 	provider := getDNSAd()
 	provider.ConvertToUpdatable()
 	json, err := provider.GetJsonSchema()