jiri-test/internal/test/github.go: Mirror messenger

Add messenger to the list of mirrored repos.

Change-Id: I7aaf9fb228ba4d206e71fe01f1aca1f90e41ed7a
diff --git a/jiri-test/internal/test/github.go b/jiri-test/internal/test/github.go
index 97e7883..e970896 100644
--- a/jiri-test/internal/test/github.go
+++ b/jiri-test/internal/test/github.go
@@ -116,6 +116,11 @@
 			github:       "git@github.com:vanadium/media-sharing.git",
 		},
 		Mirror{
+			name:         "messenger",
+			googlesource: "https://vanadium.googlesource.com/release.projects.messenger",
+			github:       "git@github.com:vanadium/messenger.git",
+		},
+		Mirror{
 			name:         "mojo.discovery",
 			googlesource: "https://vanadium.googlesource.com/release.mojo.discovery",
 			github:       "git@github.com:vanadium/mojo.discovery.git",