Last releases broke the emulator for me

I don't think you know what you're doing at all, no one updates Dolphin with unmerged PRs unless they're testing a specific PR, it makes zero sense updating using unmerged PRs because you're going backwards to different random PRs based on older masters and you also take the chance of tainting your caches with PRs that are unstable enough to ruin a cache or even user data. People update dolphin with merged PRs instead using their download page's development builds section.
Also, you didn't mention what WIP PR specifically didn't boot at all. If you update every week from random unmerged PRs it's almost certain you're downloading a random different PR every time you download a build.

Dolphin doesn't have a full list of builds for unmerged PRs like AppVeyor History, you can only download specific unmerged PRs by going into the buildjob for a specific PR (e.g. https://buildbot.dolphin-emu.org/#/build...uilds/5081)

Many unmerged PRs are not meant to work at all (valid for every project there is) and are just very WIP versions of something left open for discussion / early code review or suggestions, like the MSAA branch where games wouldn't boot until recently on purpose since the thing wasn't fully written.

Maybe you meant to update using merged PRs, which is what the rpcs3.net/download page is there for, same thing as the merged PR builds in dolphin-emu.org/download.
AppVeyor History is for unmerged PRs and only to be used to download specific PR builds for testing that specific PR before it's merged.