add retry logic in ldap.PrepareTestContainer (#27617)

helper/testhelpers/ldap/ldaphelper.go

@@ -49,6 +49,9 @@ func PrepareTestContainer(t *testing.T, version string) (cleanup func(), cfg *ld
 	cfg.RequestTimeout = 60
 	cfg.MaximumPageSize = 1000
 
+	var started bool
+
+	for i := 0; i < 3; i++ {
 		svc, err := runner.StartService(context.Background(), func(ctx context.Context, host string, port int) (docker.ServiceConfig, error) {
 			connURL := fmt.Sprintf("ldap://%s:%d", host, port)
 			cfg.Url = connURL
@@ -71,13 +74,22 @@ func PrepareTestContainer(t *testing.T, version string) (cleanup func(), cfg *ld
 			t.Logf("could not start local LDAP docker container: %s", err)
 			t.Log("Docker container logs: ")
 			t.Log(logsWriter.String())
-		t.FailNow()
+			continue
 		}
 
-	return func() {
+		started = true
+		cleanup = func() {
 			if t.Failed() {
 				t.Log(logsWriter.String())
 			}
 			svc.Cleanup()
-	}, cfg
+		}
+		break
+	}
+
+	if !started {
+		t.FailNow()
+	}
+
+	return cleanup, cfg
 }