Autorest generates C# Client Sdk that needs a beta package

[DerDani2081]

Unfortunately autorest generates a project file that needs a beta nuGet package.

<PackageReference Include="Microsoft.Azure.AutoRest.CSharp" Version="3.0.0-beta.20210205.2" />

Of course, nuGet pack is not able to pack a project with beta or pre-release dependencies.

I use the latest version of autorest and this cli command:
'autorest --verbose --v3 --csharp --add-credentials --input-file="$(Build.ArtifactStagingDirectory)\definition-$(version).yaml" --output-folder="$(Build.Repository.LocalPath)\Api\src\ClientSdk" --namespace="ClientSdk" --override-client-name="Client"'

The generated project file looks like this:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
    <Nullable>annotations</Nullable>
  </PropertyGroup>

  <PropertyGroup>
    <LangVersion>8.0</LangVersion>
    <IncludeGeneratorSharedCode>true</IncludeGeneratorSharedCode>
	  <RestoreAdditionalProjectSources>https://azuresdkartifacts.blob.core.windows.net/azure-sdk-tools/index.json</RestoreAdditionalProjectSources>
  </PropertyGroup>

  <ItemGroup>
	  <PackageReference Include="Microsoft.Azure.AutoRest.CSharp" Version="3.0.0-beta.20210205.2" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Azure.Core" Version="1.6.0" />
  </ItemGroup>

</Project>

The Pipeline that generates, packs and push the Client Sdk looks like that:

steps: 
  - powershell: 'npm install -g autorest@latest'
    displayName: "Install AutoRest"
  - task: AzurePowerShell@4
    displayName: "Download Swagger"
    inputs:
      azureSubscription: ${{parameters.subscription}}
      scriptType: 'InlineScript'
      azurePowerShellVersion: 'LatestVersion'
      inline: |
        $context = New-AzApiManagementContext -ResourceGroupName "${{parameters.apimResourceGroup}}" -ServiceName "${{parameters.apim}}"  
        Export-AzApiManagementApi -Context $context -ApiId "$(appName)-development" -SpecificationFormat OpenApi -SaveAs "$(Build.ArtifactStagingDirectory)\definition-$(version).yaml"
  - powershell: 'autorest --verbose --v3 --csharp --add-credentials --input-file="$(Build.ArtifactStagingDirectory)\definition-$(version).yaml" --output-folder="$(Build.Repository.LocalPath)\Api\src\ClientSdk" --namespace="ClientSdk" --override-client-name="Client"'
    displayName: 'Run AutoRest'    
  - task: DotNetCoreCLI@2
    displayName: "Pack Projects"
    inputs:
      command: "pack"
      arguments: "--configuration $(buildConfiguration) --include-symbols"
      packagesToPack: "**/ClientSdk.csproj"
      versioningScheme: "off"
      verbosityPack: "Normal"
  - task: DotNetCoreCLI@2
    inputs:
      command: 'push'
      packagesToPush: '$(Pipeline.Workspace)/**/*.nupkg;!$(Pipeline.Workspace)/**/*.symbols.nupkg'
      nuGetFeedType: 'internal'
      publishVstsFeed: ${{parameters.nugetfeed}}

Of course, the nuGet pack task failes with this error

1>C:\Program Files\dotnet\sdk\5.0.102\Sdks\NuGet.Build.Tasks.Pack\build\NuGet.Build.Tasks.Pack.targets(207,5): error NU5104: A stable release of a package should not have a prerelease dependency. Either modify the version spec of dependency "Microsoft.Azure.AutoRest.CSharp [3.0.0-beta.20210205.2, )" or update the version field in the nuspec.

Expected Behavior

Autorest only uses stable packages version, so we can pack and push the generated Client Sdk.

[pakrym]

cc @ShivangiReja we need to add PrivateAssets="All" to the package reference.