How can I see the "npm ERR! /home/travis/.npm/_logs/202...-debug.log"?

Hi,

My build fails after
$ npm install
an the log suggests to read the above log.
A colleague tells me: you have to login with ssh and look at it on the travis server shell you get.

Unfortunately, I don’t see where I could upload my id_rsa.pub .

Is there any other way to see this log / fix npm there (it does work locally)

Many thanks in advance

newbie greetings
Ralf

P.S.: https://stackoverflow.com/questions/27444891/how-to-add-ssh-key-in-travis-ci
is the closest to my question I found, but isn’t really on target either