add a sleep

.travis.yml

@@ -10,6 +10,7 @@ script:
   - git clone https://github.com/tripal/docker-tripal-centos  && cd docker-tripal-centos
   - cd tripal-v2 && docker build -t tripal-v2 .
   - docker run -it -d --name tripal-v2 -p 8080:80 tripal-v2 /bin/bash
+  - sleep 40  #need to sleep after booting docker
   - docker exec -it tripal-v2 bash -c 'drush pm-disable tripal_core -y && cd /var/www/html/sites/all/modules/tripal/ && git checkout 7.x-3.x && drush pm-enable tripal -y && drush pm-enable tripal_chado -y && drush cc all --yes && drush status'
   - cd ../tripal-v3 && docker build -t tripal-v3 .
   - docker run -it -d --name tripal-v3 -p 8082:80 tripal-v3 /bin/bash