SourceLink support for easier debug

[Luiz-Monad]

Context:
I was trying to find an amusing problem with my SAFE app on docker-alpine-aspnet, then I stumbled in a crash that ApplicationInsights wasn't reporting any error, only that the request returned 500 - internal server error. My problem turned out to be some stupid missing dependencies because of a broken paket.lock, now our problem at hand.

Problem:
Now the problem I had with my debugging is that when I got the Visual Studio to attach inside the Kestrel inside the container, It didn't had the Saturn.pdb that would support the debugging experience, so I couldn't put breakpoints.

Workaround
I found an workaround by following this issue dotnet/sdk#1458, from dotnet/msbuild#2920.
Better support for pdb on nuget is being developed (tracked by this NuGet/Home#5926), meanwhile if we use the sourcelink, it will fix everything magically.

Proposed Solution
Doing the same as what this project did (abpframework/abp#6421) would solve the sourcelink problem.

Note that somehow Giraffe does it right.
1

[clairernovotny]

We released a NuGet package you can add to make this easier to configure. Directions are in the readme: https://github.com/dotnet/reproducible-builds

[baronfel]

Nice @clairernovotny, that will reduce a lot of the boilerplate!