Fixed Packet Capture Docker Compose

contrib/packetcapture/docker-compose.yml

@@ -39,8 +39,8 @@ services:
       - PACKETCAPTURE_MQTT3_TOKEN_AUDIENCE=${CUSTOM_MQTT_AUDIENCE}
       - PACKETCAPTURE_MQTT3_KEEPALIVE=120
       # Area/Origin
-      - PACKETCAPTURE_IATA=${IATA}
-      - PACKETCAPTURE_ORIGIN=${ORIGIN:observer}
+      - PACKETCAPTURE_IATA=${IATA:-STN}
+      - PACKETCAPTURE_ORIGIN=${ORIGIN:-observer}
       # Schedule/Timeouts
       - PACKETCAPTURE_ADVERT_INTERVAL_HOURS=${ADVERT_INTERVAL_HOURS:-11}
     restart: unless-stopped