github mirror: adds luma third_party

Change-Id: I3acc8956aed94b465fce361baa15f84af9826bd5
diff --git a/jiri-test/internal/test/github.go b/jiri-test/internal/test/github.go
index d4d7ded..d29df68 100644
--- a/jiri-test/internal/test/github.go
+++ b/jiri-test/internal/test/github.go
@@ -90,6 +90,11 @@
 			github:       "git@github.com:vanadium/js.syncbase.git",
 		},
 		Mirror{
+			name:         "luma.third_party",
+			googlesource: "https://vanadium.googlesource.com/release.projects.luma_third_party",
+			github:       "git@github.com:vanadium/luma.third_party.git",
+		},
+		Mirror{
 			name:         "madb",
 			googlesource: "https://vanadium.googlesource.com/release.projects.madb",
 			github:       "git@github.com:vanadium/madb.git",