First of all thanks for putting effort into this, much appreciated!
Second:
I cloned the repo and ran build.ps1 as is, but on my machine no build folder was created. Like you said in your blog post, this can happen if you're missing the publishUrl property. But this is clearly there in FolderProfile.pubxml. The only thing I had to change was the path to msbuild. It wouldn't build it with C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\MSBuild\15.0\bin. Had to change it to C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\Bin. I don't know whether or not this would have any effect of the kind I'm talking about, but I wouldn't think so... The error I got when running with the original msbuild was:
Build FAILED.
"C:\Repos\test\Azure-Function-MSBuild\FuncAppDemo\FuncAppDemo.csproj" (default target) (1) ->
C:\Repos\test\Azure-Function-MSBuild\FuncAppDemo\FuncAppDemo.csproj : error MSB4019: The imported project "C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\
MSBuild\Sdks\Microsoft.NET.Sdk\Sdk\Sdk.props" was not found. Confirm that the path in the declaration is correct, and that the file exists on disk.
f00
commented
7 years ago 
First of all thanks for putting effort into this, much appreciated!
Second: I cloned the repo and ran
build.ps1as is, but on my machine no build folder was created. Like you said in your blog post, this can happen if you're missing thepublishUrlproperty. But this is clearly there inFolderProfile.pubxml. The only thing I had to change was the path to msbuild. It wouldn't build it withC:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\MSBuild\15.0\bin. Had to change it toC:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\Bin. I don't know whether or not this would have any effect of the kind I'm talking about, but I wouldn't think so... The error I got when running with the original msbuild was: