dashboard: increase GO_TEST_TIMEOUT_SCALE for dragonfly builders

This sets the GO_TEST_TIMEOUT_SCALE=2 for dragonfly builders in order
to try to solve intermittent test failures.

For golang/go#45215.
For golang/go#34034.
Fixes golang/go#45216.

Change-Id: I81dae533c137ff1903bf6b1a52cf9752e8921b7c
GitHub-Last-Rev: 9b4fb8017baebab4126a9d318f14f707eea79f9a
GitHub-Pull-Request: golang/build#35
Reviewed-on: https://go-review.googlesource.com/c/build/+/315329
Run-TryBot: Carlos Amedee <carlos@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Carlos Amedee <carlos@golang.org>
diff --git a/dashboard/builders.go b/dashboard/builders.go
index 549c57d..6648644 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -2606,6 +2606,7 @@
 		HostType:       "host-dragonfly-amd64-master",
 		Notes:          "DragonFly BSD master, run by DragonFly team",
 		distTestAdjust: noTestDirAndNoReboot,
+		env:            []string{"GO_TEST_TIMEOUT_SCALE=2"}, // see golang.org/issue/45216
 		SkipSnapshot:   true,
 		buildsRepo: func(repo, branch, goBranch string) bool {
 			return atLeastGo1(goBranch, 14) && buildRepoByDefault(repo)
@@ -2616,6 +2617,7 @@
 		HostType:       "host-dragonfly-amd64-5_8",
 		Notes:          "DragonFly BSD 5.8 release",
 		distTestAdjust: noTestDirAndNoReboot,
+		env:            []string{"GO_TEST_TIMEOUT_SCALE=2"}, // see golang.org/issue/45216
 		SkipSnapshot:   true,
 	})
 	addBuilder(BuildConfig{