build(ci): Disable verbose logging for client-testing.

Author: timoxley

.github/workflows/test-build.yml

@@ -190,4 +190,4 @@ jobs:
           max_attempts: 2
           timeout_minutes: 15
           retry_on: error
-          command: cd streamr-client-testing && java -jar build/libs/client_testing-1.0-SNAPSHOT.jar -s $TEST_NAME -c config/$CONFIG_NAME.conf -n $NUM_MESSAGES
+          command: cd streamr-client-testing && DEBUG='' java -jar build/libs/client_testing-1.0-SNAPSHOT.jar -s $TEST_NAME -c config/$CONFIG_NAME.conf -n $NUM_MESSAGES