https://bugs.winehq.org/show_bug.cgi?id=43436
--- Comment #5 from Michael Müller michael@fds-team.de --- The mageia 6 installer had 32 bit multiarch enabled by default, but I am not sure if it also applies to dnf. Anyway, it makes sense to mention it in the installation instructions as someone might have disabled it.
Regarding the testing key: The packages are signed by the host system when publishing them into a repository. As soon as they get published into the official repository, they also get the correct signature. You can remove the repository and key again. Mageia 6 is now enabled by default and is picked up for the daily builds (e.g. [1]) and release builds. The correct url will be [2], but you will need to wait till Wine (Staging) 2.18 is released before it will work.
[1]: https://dev.wine-staging.com/builder/group/269/ [2]: https://dl.winehq.org/wine-builds/mageia/6/winehq.repo