AzureDevOps: NuGetCommand@2 push to DotNetCoreCLI@2 custom nuget push, with VSTS feed?

• Build machine Ubuntu 24.04
• Need to replace task NuGetCommand@2 by DotNetCoreCLI@2.
• Push to private AzureDevOps Feed ("VSTS", legacy name from before AzureDevOps)
• Must run push command with option --skip-duplicate (param allowPackageConflicts: true in old task).
• Must replace publishVstsFeed:<guid1>/<guid2> in task by --source <URL>. How?

In a pipeline under Ubuntu 24.04, the old NuGetCommand@2 task doesn't work anyore, because requires .NET Mono, which is no longer part of Ubuntu 24.04 build machines.

• _DotNetCoreCLI@2 command: 'push' supports neither allowPackageConflicts: true, nor arguments: '--skip-duplicate'.

So I end up with something like this task:

  - task: DotNetCoreCLI@2
    displayName: DotNet NuGet push
    inputs:
      # required, because NuGetCommand@2 allowPackageConflicts missing.
      command: 'custom'
      custom: 'nuget'
      # --skip-duplicate is the direct option 
      # to replace allowPackageConflicts: true. 
      arguments: 'push $(Build.SourcesDirectory)/packagesMyPacksDir/*.nupkg --source https://pkgs.dev.azure.com/my-company/<guid1>/_packaging/<guid2>/nuget/v3/index.json -ApiKey VSTS'

But with a custom command, all the options to resolve the feed URL, as internally happening in the old NuGetCommand@2 task or with DotNetCoreCLI push, do not work.

My idea was to simply insert <guid1> and <guid2> into the --source URL, but when I looked at older builds, with the NuGetCommand@2 task, I noticed that the second GUID wasn't the /<guid2> value from previous publishVstsFeed:<guid1>/<guid2>, but another GUID with every new pipeline run.

So how do I build the --source URL?

Possible alternative: If there was a chance to list all NuGet packages to push, and use DotNetCoreCLI push commands in a loop, it might work without building a source URL, but I found no way yet to loop over a varying number of files.

Ran into the exact same problems converting our existing pipeline to keep working on the Ubuntu 24 image from DevOps. Eventually ended up with the following solution:

- task: DotNetCoreCLI@2
  displayName: Custom push
  inputs:
    command: custom
    custom: nuget
    arguments: push $(Pipeline.Workspace)/{artifactName}/*.nupkg --source https://pkgs.dev.azure.com/${{ parameters.nugetFeedOrganization }}/${{ parameters.nugetFeedProject }}/_packaging/${{ parameters.nuGetFeed }}/nuget/v3/index.json --api-key VSTS --skip-duplicate

Not ideal that we have to pass the organization/project as parameters (or hardcode them), since with the built in argument for feed just the feed name is enough to resolve it, but it works for us.