arcade: [rollout issue] Arcade publishing broken as of latest Arcade-services deployment

Build

https://dnceng.visualstudio.com/internal/_build/results?buildId=1789965&view=logs&j=226748d0-f812-5437-d3f0-2dd291f5666e&t=bad11196-972e-5d03-45a8-9db526506073

https://dnceng.visualstudio.com/internal/_build/results?buildId=1789677&view=logs&j=29d4eac0-e772-56a4-ad0d-2d727d908ceb&t=4edcb01d-2da8-54c4-439e-584d3c1a5e90

https://dnceng.visualstudio.com/internal/_build/results?buildId=1789315&view=logs&s=0d7db6e4-c533-50c8-77c7-b1b9fc049ed6&j=226748d0-f812-5437-d3f0-2dd291f5666e

Build leg reported

No response

Pull Request

No response

Action required for the engineering services team

To triage this issue (First Responder / @dotnet/dnceng):

• Open the failing build above and investigate
• Add a comment explaining your findings

If this is an issue that is causing build breaks across multiple builds and would get benefit from being listed on the build analysis check, follow the next steps:

1. Add the label “Known Build Error”
2. Edit this issue and add an error string in the Json below that can help us match this issue with future build breaks. You should use the known issues documentation

{
   "ErrorMessage" : "The framework 'Microsoft.NETCore.App', version '6.0.0' was not found."
}

Additional information about the issue reported

I believe this was caused by the upgrade of all of arcade-services to use .net 6. The latest version of darc requires a 6.0 runtime to be installed in the machine.