[build] Make SDK artifacts independent of the builder's working directory.

Bug: https://github.com/dart-lang/sdk/issues/64169
Change-Id: Ib7ae15e5b460e18e64d92a6aa9d735f488070db5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/543800
Reviewed-by: Slava Egorov <vegorov@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

Ryan Macnak committed 1d ago

36621baad44b81e4097191e4175ef4f9ea72522d

Parent: 4262a73

Committed by dart-scoped@luci-project-accounts.iam.gserviceaccount.com <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> on 9/2/2026, 4:17:59 PM