cmd/coordinator, dashboard: cross compile linux-arm-arm5spacemonkey

Change-Id: I3a228627ec8236d0d10bb9a1a61443c81493145d
Reviewed-on: https://go-review.googlesource.com/38460
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/dashboard/builders.go b/dashboard/builders.go
index 95d6e60..a095124 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -34,6 +34,12 @@
 		buildletURLTmpl: "http://storage.googleapis.com/$BUCKET/buildlet.linux-amd64",
 		env:             []string{"GOROOT_BOOTSTRAP=/go1.4"},
 	},
+	"host-linux-armel-cross": &HostConfig{
+		Notes:           "Kubernetes container on GKE built from env/crosscompile/linux-armel-stretch",
+		KubeImage:       "linux-armel-stretch:latest",
+		buildletURLTmpl: "http://storage.googleapis.com/$BUCKET/buildlet.linux-amd64",
+		env:             []string{"GOROOT_BOOTSTRAP=/go1.4"},
+	},
 
 	"host-nacl-kube": &HostConfig{
 		Notes:           "Kubernetes container on GKE.",