Add .NET 10 to build image

appveyor.yml

@@ -10,7 +10,12 @@ assembly_info:
   file: 'Properties\AssemblyInfo.cs'
   assembly_version: "{version}"
   assembly_file_version: "{version}"
+install:
+- ps: |
+    Invoke-WebRequest -Uri 'https://dot.net/v1/dotnet-install.ps1' -UseBasicParsing -OutFile "$env:temp\dotnet-install.ps1"
+    & $env:temp\dotnet-install.ps1 -Architecture x64 -Version '10.0.100' -InstallDir "$env:ProgramFiles\dotnet"
 before_build:
+  - ps: dotnet --version
   - ps: nuget restore .\Installer\
   - ps: dotnet publish .\Application\ /p:PublishProfile=Properties\PublishProfiles\x64.pubxml
 build: