cmd/release: skip tests on linux-arm

They take too long.

Change-Id: I4748992e1e4af6bc8d5721337de87408003b35fc
Reviewed-on: https://go-review.googlesource.com/73511
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>
diff --git a/cmd/release/release.go b/cmd/release/release.go
index 0e8b7c3..888f75d 100644
--- a/cmd/release/release.go
+++ b/cmd/release/release.go
@@ -174,6 +174,9 @@
 		Arch:    "arm",
 		Builder: "linux-arm",
 		Goarm:   6, // for compatibility with all Raspberry Pi models.
+		// The tests take too long for the release packaging.
+		// Much of the time the whole buildlet times out.
+		MakeOnly: true,
 	},
 	{
 		OS:      "linux",