Build system: need to push symbol packages to NuGet

[Aaronontheweb]

Right now I don't think our current dotnet push command uploads the .snupkg files that contain debugging symbols for Akkatecture. These are needed in order to ensure that SourceLink et al all work properly.

Relevant area of build system:

Akkatecture/.github/workflows/publish-nuget.yml

Lines 36 to 44 in b7c7fd0

	- name: Build Packages
	run: |
	dotnet restore
	dotnet build -c Release
	dotnet pack -c Release --no-build /p:Version=${env:VERSION} --output ./bin/nuget
	- name: Push Packages
	working-directory: ./bin/nuget
	run: dotnet nuget push "*.nupkg" -k "${{secrets.NUGET_API_KEY}}" -s https://api.nuget.org/v3/index.json --skip-duplicate

[Aaronontheweb]

Might also need to delete this

Akkatecture/Directory.Build.props

Line 14 in b7c7fd0

<AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>

I don't think that's necessary if a separate symbol package is being published.