add ffscustom package repo

modules

-GLUON_SITE_FEEDS='ffs ssidchanger'
+GLUON_SITE_FEEDS='ffs ssidchanger ffscustom'
 
 PACKAGES_FFS_REPO=https://gitlab.freifunk-stuttgart.de/firmware/gluon-packages.git
 PACKAGES_FFS_COMMIT=caff6fa7e00e4112ebe084955749cb9e42685e90
@@ -6,3 +6,7 @@ PACKAGES_FFS_COMMIT=caff6fa7e00e4112ebe084955749cb9e42685e90
 PACKAGES_SSIDCHANGER_REPO=https://gitlab.freifunk-stuttgart.de/firmware/gluon-ssid-changer.git
 PACKAGES_SSIDCHANGER_COMMIT=3c6750ce8fc9cedabfa8a6f479fb12d343c6ecc2
 PACKAGES_SSIDCHANGER_BRANCH=2018.1.x
+
+PACKAGES_FFSCUSTOM_REPO=https://gitlab.freifunk-stuttgart.de/nrb/gluon-custom-packages.git
+PACKAGES_FFSCUSTOM_COMMIT=986926cd7fdd296050f6fb3b2861440844fb64cb
+PACKAGES_FFSCUSTOM_BRANCH=nrb/ffs-prometheus-node-exporter