CLI Tools: Add --runtime

[wapac]

I have a project with csproj containing

    <RuntimeIdentifier>win10-x64</RuntimeIdentifier>

as Win10 is my main dev machine.

When the project source is downloaded on Ubuntu machine, the build process succeeds using this command:

dotnet publish --configuration Release --runtime ubuntu.14.04-x64

but then

dotnet ef database update

fails with this message:

Could not find required library libhostpolicy.so in 2 probing paths:
  /home/user/.nuget/packages
  /home/user/.nuget/packages
A fatal error was encountered. The library 'libhostpolicy.so' required to execute the application was not found in '/home/user/project/src/Project/bin/Debug/netcoreapp1.1/win10-x64'.

If RuntimeIdentifier is changed to ubuntu.14.04-x64 in csproj file:

    <RuntimeIdentifier>ubuntu.14.04-x64</RuntimeIdentifier>

dotnet ef database update command succeeds. This requires everyone who wants to build the project and generate database to rewrite csproj file. There is no --runtime argument with dotnet ef database update that one could use to overwrite this on command line.