Update deploy script.

appveyor.yml

@@ -12,6 +12,8 @@ after_build:
   - ps: dotnet tool restore
   - ps: dotnet format --dry-run --check
   - ps: .\InspectCode.ps1
+artifacts:
+  - path: '**\*.nupkg'
 test:
   assemblies:
     except:

appveyor_deploy.yml

@@ -1,10 +1,18 @@
 clone_depth: 1
 version: '{build}'
 image: Visual Studio 2019
+before_build:
+  - ps: dotnet --info # Useful when version mismatch between CI and local
+  - ps: nuget restore -verbosity quiet # Only nuget.exe knows both new (.NET Core) and old (Xamarin) projects
 test: off
 skip_non_tags: true
-build_script:
-  - cmd: PowerShell -Version 2.0 .\build.ps1
+configuration: Release
+build:
+  project: osu.sln
+  parallel: true
+  verbosity: minimal
+artifacts:
+  - path: '**\*.nupkg'
 deploy:
   - provider: Environment
     name: nuget

osu.Game/osu.Game.csproj

@@ -8,6 +8,7 @@
     <Title>osu!</Title>
     <PackageId>ppy.osu.Game</PackageId>
     <PackageIcon>icon.png</PackageIcon>
+    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
   </PropertyGroup>
   <ItemGroup Label="Icon">
     <None Include="..\assets\lazer-nuget.png">