[infra] Add service account override in gen_tasks.go.

This CL is a prerequisite for re-landing
https://skia-review.googlesource.com/c/skia/+/121481

Bug: skia:7050
No-Try: true
Change-Id: Ice9d40c1df75734c1ec429be9cf4605a6098ce80
Reviewed-on: https://skia-review.googlesource.com/121490
Commit-Queue: Eric Boren <borenet@google.com>
Auto-Submit: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
1 file changed