[QGIS-Developer] Docker pull rate limit / Travis

[pathmapper]

Hi,

due to the recently introduced docker pull rate limits there are 
currently quite a lot Travis builds failing because of such a limit.

According to this blogpost: 
https://www.docker.com/blog/what-you-need-to-know-about-upcoming-docker-hub-rate-limiting/

"[...] non-commercial open source projects can apply for a sponsored 
Open Source Docker account by filling out this application. No pull rate 
restrictions will be applied to namespaces approved as non-commercial 
Open Source projects."

Don't know if such an application for a sponsored Open Source Docker 
account would be something the QGIS project would be interested in or if 
the QGIS Docker account is already sponsored. A sponsored Docker account 
might help a little bit reaching these limits e.g. regarding pulling:

https://hub.docker.com/r/qgis/qgis3-build-deps

Cheers,
pathmapper