Update and rename dotnetcore-sdk-bin-5.0.100_pre6.ebuild to pre7 +arm/64 bins,

[necrose99]

…e-sdk-bin-5.0.100_pre7.ebuild

http://gpo.zugaina.org/AJAX/Ebuild/52583204 Overlay: tresorit newer. https://dotnet.microsoft.com/download/dotnet/thank-you/sdk-5.0.100-preview.7-linux-x64-binaries , arm/arm64 appended.

[cnd]

@necrose99 manifest update missing, I will add