The helix CI job builds tests/helix/send-to-helix-ci.proj, which in turns builds the Test target on tests/helix/send-to-helix-inner.proj. This inner project uses the Helix SDK to construct @(HelixWorkItem)s, and send them to helix to run.
tests/helix/send-to-helix-basictests.targets- this prepares all the tests that don't need special preparationtests/helix/send-to-helix-endtoend-tests.targets- this is for tests that require a sdk+workload installed
.\build.cmd -packdotnet build tests\workloads.proj
.. which results in artifacts\bin\dotnet-latest which has a sdk (version from global.json) with the aspire workload installed using packs from artifacts/packages.