The current error fatal: empty ident name (for <vsts_azpcontainer@5486fd8241d9.(none)>) not allowed is a few things coming together:

• dotnet/arcade has bad line endings in a few files, so even in a fresh clone in CI, some changes show up.
  • Submitted Renormalize line endings (match .gitattributes) #6874 to fix this.
• The source-build tooling creates an extra clone of the repo in artifacts/ to run the build in. When there are changes in the outer repo, the source-build tooling creates a Git stash to transfer the changes into the inner repo.
  • Copying WIP changes will always be disabled in CI once Arcade uses a version of Arcade that includes PR Add source-build inner clone shallow repo support #6865, but we aren't quite there yet.
• Containers don't have a Git author set up, and making a stash requires that, so we hit the error.

#6874 will unblock this for now, and eventually an auto-update will get the tooling change in case something weird like this happens again (or in another repo).

Nice, green. I'd recommend doing a mock official build too, to make sure the source-build intermediate package can flow as expected.

Tried with the official build pipeline, green too so merging:
https://dnceng.visualstudio.com/internal/_build/results?buildId=971631&view=logs&j=1217766f-bb40-52a2-b66d-f8ecc3a6dc68