include Prometheus in the menu

Author: llusdess

menu.sh

@@ -24,6 +24,7 @@ declare -A cont_array=(
 	[transmission]="transmission"
 	[grafana]="Grafana"
 	[mosquitto]="Eclipse-Mosquitto"
+	[prometheus]="Prometheus"
 	[postgres]="Postgres"
 	[timescaledb]="Timescaledb"
 	[mariadb]="MariaDB (MySQL fork)"
@@ -55,6 +56,7 @@ declare -a armhf_keys=(
 	"grafana"
 	"mosquitto"
 	"telegraf"
+	"prometheus"
 	"mariadb"
 	"postgres"
 	"timescaledb"