dotnet: Rework snk managment
dotnet: Rework snk managment

Now you can use the env var DOTNET_SNK to set your own snk key

google/or-tools,google/or-tools,google/or-tools,or-tools/or-tools,or-tools/or-tools,or-tools/or-tools,google/or-tools,or-tools/or-tools,google/or-tools,google/or-tools,or-tools/or-tools,or-tools/or-tools