app/build: add oauth2 to build dashboard

Fixes golang/go#12775

Change-Id: I9ac3870bb27b8dc715fcd0628993965086642b4d
Reviewed-on: https://go-review.googlesource.com/19879
Reviewed-by: Burcu Dogan <jbd@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed