DEBUG authentication error in CI

[hagenw]

Debug authentication errors we experience in #178

[hagenw]

@frankenjoe I tried to debug the content of the username and api key env variables here by printing them to stdout.
Thios is what I get:

----------------------------- Captured stdout call -----------------------------
140
os.environ['ARTIFACTORY_USERNAME']='***'
141
os.environ['ARTIFACTORY_API_KEY']='***'

So I'm not sure yet if Github somehow manages to avoid them being displayed or if our current approach how we assign those variables no longer works.

[hagenw]

No longer needed.

The authentication issue was temporary and went away after waiting a few days.