Installer: Handle custom networks/domains

Change-Id: Id88e82a0757365466d92fb31223e21b7199ef940
diff --git a/core/installer/app_repository.go b/core/installer/app_repository.go
index 27b9b43..df35ae8 100644
--- a/core/installer/app_repository.go
+++ b/core/installer/app_repository.go
@@ -33,6 +33,7 @@
 	// "values-tmpl/qbittorrent.cue",
 	// "values-tmpl/jellyfin.cue",
 	"values-tmpl/rpuppy.cue",
+	"values-tmpl/certificate-issuer-custom.cue",
 }
 
 var envAppConfigs = []string{