dashboard: add linux-mipsle-mengzhuo builder

Updates golang/go#31217

Change-Id: I7bda4f3ddf7dc76bdd974726747621f69a7acfa0
Reviewed-on: https://go-review.googlesource.com/c/build/+/191577
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/dashboard/builders_test.go b/dashboard/builders_test.go
index c004433..5dc53c5 100644
--- a/dashboard/builders_test.go
+++ b/dashboard/builders_test.go
@@ -315,6 +315,10 @@
 		{b("linux-amd64@go1.11", "net@1.11"), both},
 		{b("linux-amd64@go1.12", "net@1.12"), both},
 
+		{b("linux-mips64le-mengzhuo", "go"), onlyPost},
+		{b("linux-mips64le-mengzhuo", "sys"), onlyPost},
+		{b("linux-mips64le-mengzhuo", "net"), onlyPost},
+
 		// go1.12.html: "Go 1.12 is the last release that is
 		// supported on FreeBSD 10.x [... and 11.1]"
 		{b("freebsd-386-10_3", "go"), none},