To run manually on CI:
    export BOX_VERSION=<version_to_test>
    pm2-run --ecosystem ../ecosystem.json --env staging --cmd "npm test"

To run specific test on CI:
    cd ~/app
    export BOX_VERSION=<version_to_test>
    pm2-run --ecosystem ../ecosystem.json --env staging --cmd "DEBUG=superagent-sync,e2e:* DEBUG_COLORS=true ./node_modules/.bin/mocha --bail test/new-user-test.js"