fix: stabilize software updates

internal/updateagent/controller_test.go

@@ -67,7 +67,7 @@ func TestControllerValidatesRequestsAndRunsOnlyOneUpdate(t *testing.T) {
 		t.Fatalf("request without current version accepted: status=%d", missingCurrent.Code)
 	}
 
-	const secret = "registry-token-must-not-leak"
+	const secret = " registry-password-must-not-be-trimmed "
 	body := []byte(`{"version":"v2.0.0","current_version":"v1.4.0","registry_username":"user","registry_token":"` + secret + `"}`)
 	accepted := httptest.NewRecorder()
 	handler.ServeHTTP(accepted, httptest.NewRequest(http.MethodPost, "/v1/update", bytes.NewReader(body)))