add CLI command to register runner tokens (#23762)

This is a CLI command to generate new tokens for the runners to register
with

Fix https://github.com/go-gitea/gitea/issues/23643

---------

Co-authored-by: delvh <dev.lh@web.de>

main.go

@@ -75,6 +75,7 @@ arguments - which can alternatively be run by running the subcommand web.`
 		cmd.CmdDocs,
 		cmd.CmdDumpRepository,
 		cmd.CmdRestoreRepository,
+		cmd.CmdActions,
 	}
 	// Now adjust these commands to add our global configuration options