cmd/gerritbot, cmd/gitmirror, maintner/maintnerd: add x/mod repo

Updates #31761

Change-Id: I2a9372cc95d3339e4f821b450e1973447ca68628
Reviewed-on: https://go-review.googlesource.com/c/build/+/176467
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/cmd/gerritbot/gerritbot.go b/cmd/gerritbot/gerritbot.go
index d0ead74..e974418 100644
--- a/cmd/gerritbot/gerritbot.go
+++ b/cmd/gerritbot/gerritbot.go
@@ -204,6 +204,7 @@
 	"image":          true,
 	"lint":           true,
 	"mobile":         true,
+	"mod":            true,
 	"net":            true,
 	"oauth2":         true,
 	"perf":           true,
diff --git a/cmd/gitmirror/gitmirror.go b/cmd/gitmirror/gitmirror.go
index 9344db9..3ecf33b 100644
--- a/cmd/gitmirror/gitmirror.go
+++ b/cmd/gitmirror/gitmirror.go
@@ -292,6 +292,7 @@
 		"image",
 		"lint",
 		"mobile",
+		"mod",
 		"net",
 		"oauth2",
 		"playground",
diff --git a/maintner/maintnerd/maintnerd.go b/maintner/maintnerd/maintnerd.go
index 9355604..57f8303 100644
--- a/maintner/maintnerd/maintnerd.go
+++ b/maintner/maintnerd/maintnerd.go
@@ -317,6 +317,7 @@
 	"golang/image",
 	"golang/lint",
 	"golang/mobile",
+	"golang/mod",
 	"golang/net",
 	"golang/oauth2",
 	"golang/perf",