dashboard: skip some slow tests on linux-arm

Fixes golang/go#35543

Change-Id: I2554d6ef8400201f10f5f0f0a45a5bbd53104f95
Reviewed-on: https://go-review.googlesource.com/c/build/+/206799
Reviewed-by: Bryan C. Mills <bcmills@google.com>
diff --git a/dashboard/builders.go b/dashboard/builders.go
index cdcb99e..c68ebed 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -1735,6 +1735,13 @@
 		FlakyNet:          true,
 		numTestHelpers:    2,
 		numTryTestHelpers: 7,
+		shouldRunDistTest: func(distTest string, isTry bool) bool {
+			switch distTest {
+			case "api", "reboot":
+				return false
+			}
+			return true
+		},
 	})
 	addBuilder(BuildConfig{
 		Name:          "linux-arm-nativemake",