Add fedora 29 to testing infrastructure

[lslebodn]

Final freeze for fedora 29 was few days ago [1] and should be released at the enn of this month.

The image in docker hub docker.io/fedora:29 is quite outdated (Upgrade 57 Packages + Install 34 Packages). It is possible to either update all packages or to use image from fedora registry
registry.fedoraproject.org/fedora:29

[1] https://fedoraproject.org/wiki/Releases/29/Schedule

[lslebodn]

@dirgim :-)

[dirgim]

@lslebodn thanks for the info, definitely in my plans for the beginning of next month.