Deployment can fail if the project directory has both a project file and a solution file

[jskeet]

Directory Layout:

• Library
  • Library.csproj
• App
  • App.sln
  • App.csproj (depends on Library.csproj)

The VS extension runs "dotnet publish" in the "App" directory without specifying that it wants to publish the project - the .NET Core SDK then publishes both projects in the target directory, leading to two .deps.json files, and Cloud Build fails.

Fix: specify the project file on the command line for dotnet publish.