Allow different identities for iOS code signing

Docs-Preview: https://skia.org/?cl=81340
Bug: skia:
Change-Id: I9a0e52ba4ce3c0c4b40cc65ce6b26bd3cebdbe4d
Reviewed-on: https://skia-review.googlesource.com/81340
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
3 files changed