Run auth util but skip dotnet installation

[sliekens]

Description:
I would like to be able to run the auth util only and skip the dotnet installer.

- name: Configure GPR authentication
  uses: actions/setup-dotnet@v3
  env:
    NUGET_AUTH_TOKEN: ${{secrets.GITHUB_TOKEN}}
  with:
    source-url: https://nuget.pkg.github.com/sliekens/index.json
    dotnet-version: 'none'
    global-json-file: 'ignore ./global.json'

Justification:
I'm running jobs inside a container that already contains the exact SDK versions needed.

Are you willing to submit a PR?

It depends

[IvanZosimov]

Hi, @sliekens 👋
Thank you for your feature request. We will investigate it and come back to you with our decision about it :)

[sliekens]

One more justification: Azure Pipelines has separate tasks for installing dotnet and for auth.
https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/tool/dotnet-core-tool-installer?view=azure-devops
https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/package/nuget-authenticate?view=azure-devops

I imagine it can be difficult for someone to move from Az Pipelines to GH Actions when you only need NuGet Authenticate.