https://bugs.winehq.org/show_bug.cgi?id=38926
--- Comment #18 from Michael Müller michael@fds-team.de --- We are currently using OBS for some of the distributions supported by Wine Staging but we think about switching away. Although they support other distributions than OpenSUSE, you clearly notice that OpenSUSE is the main target.
For other distributions they only support stable versions, which is a big problem for Debian. A lot of people are using Debian testing and you won't be able to build packages for this. I haven't tried it myself, but I was told that it is difficult to build Wine on Arch Linux using OBS. The usual approach to get a WOW64 build is to build the 32 and 64 bit version on a 64 bit machine, but OBS doesn't have the multiarch repo enabled and therefore you can't fetch the 32 bit dependencies. I don't know if there is a way to workaround the issue.
Moreover we already had multiple times the problem, that their mirrors were out of sync. For example the repository database was already updated while the new packages were not yet available. This makes it impossible to install packages. Since OBS automatically redirects you to the fastest mirror, there is no obvious way for people to try out other mirrors. I opened a bug report about this a year ago without any answer.
There also other issues like the packages inside the VMs are not updated very often and you run into version conflicts during package installation (at least for non OpenSUSE distros). On our own build servers we therefore always update the packages before building.
I don't know what would be the best way to build those packages, but it is important to choose something which will work in the long run. It is hard to change the repository url later.