dashboard: skipsnapshot for linux-mipsle-mengzhuo builder

The connection between linux-mipsle-mengzhuo and the build farm
is not stable and failed the snapshot upload stage, so we have to
skipsnapshot for that.

Updates golang/go#31217

Change-Id: Ic01620ec12254221f93234e8b25749a09f3dbc9c
Reviewed-on: https://go-review.googlesource.com/c/build/+/195977
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

dashboard/builders.go

@@ -2080,9 +2080,10 @@ func init() {
 		FlakyNet: true, // maybe not flaky, but here conservatively
 	})
 	addBuilder(BuildConfig{
-		FlakyNet: true,
-		HostType: "host-linux-mipsle-mengzhuo",
-		Name:     "linux-mips64le-mengzhuo",
+		FlakyNet:     true,
+		HostType:     "host-linux-mipsle-mengzhuo",
+		Name:         "linux-mips64le-mengzhuo",
+		SkipSnapshot: true,
 		buildsRepo: func(repo, branch, goBranch string) bool {
 			switch repo {
 			case "go", "net", "sys":