Not sure what happened to you with macincloud, but I used scaleway hosted Mac mini M1 a couple years ago for a self hosted CI server, and it was working very nicely.
Looks like it, according to the features/location:
We host our cloud instances in our own data centers in Nuremberg and Falkenstein. And we operate our data centers in accordance with ISO 27001 guidelines while also adhering to strict German data protection regulations.
Now that I'm not working in the .NET world anymore, the one thing I really miss is WPF, as soon as I'm touching any html/css. Never had any issue with z-index or something not displaying the same way on another browser because whatever is not supported.