fix: try printing visual bells to stdout

.travis.yml

@@ -43,7 +43,7 @@ install:
   - npm ci && npm link
   # Go back to workdir
   - cd $TRAVIS_BUILD_DIR
-  - travis_wait 30 export OUTPUT=$(mn setup-for-local-development 127.0.0.1 20001 --dapi-image-build-path=$TRAVIS_BUILD_DIR)
+  - travis_wait 30 ./scripts/print-visual-bells.sh &; export OUTPUT=$(mn setup-for-local-development 127.0.0.1 20001 --dapi-image-build-path=$TRAVIS_BUILD_DIR)
 
 before_script:
   - export PRIVATE_KEY=$(echo "$OUTPUT" | grep -m 1 "Private key:" | awk '{printf $4}')

scripts/print-visual-bells.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+function write_visual_bells() {
+  while true; do
+    echo -en "\a"
+    sleep 10
+  done
+}
+write_visual_bells&