CD: Automatic deployment of demo app to Firebase fails, causing Travis build badge to show “error”

[strogonoff]

There appears to be something with the credentials.

Error: HTTP Error: 401, Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.
Firebase deployment failed
failed to deploy