Is it possible to run the pulumi cli on prebuilt .net code? "pulumi preview" and "pulumi up" seems to try to build the .csproj and now that I already have built and published the app it exits with:

MSBUILD : error MSB1003: Specify a project or solution file. The current working directory does not contain a project or solution file.

Not yet, this is tracked in https://github.com/pulumi/pulumi/issues/3509. Feel free to upvote and comment on your scenario.