Simplify to standalone service on shared nocodb-network, add modem_num field

Strips embedded nocodb/postgres services from compose; switches to shared
nocodb-network. Adds modem_num to NocoDB field list. Fixes session cookie
secure flag. Removes previously-tracked XML template files (covered by .gitignore).

docker-compose.yml

@@ -1,13 +1,25 @@
 services:
+
   lldp-mapper:
-    build: .
+    build:
+      context: .
+      dockerfile: Dockerfile
     container_name: lldp-mapper
     ports:
       - "5000:5000"
     volumes:
       - ./data:/data
-      - ./config.py:/app/config.py
+      - ./config.py:/app/config.py:ro
       - ./index.html:/app/templates/index.html:ro
-    restart: unless-stopped
     environment:
       - PYTHONUNBUFFERED=1
+      - NOCODB_URL=http://nocodb:8080
+      - NOCODB_TOKEN=eWU_ilelaCtNy1JzC7vf41DokkqFOovcLHM0zVml
+    restart: unless-stopped
+    networks:
+      - nocodb-network
+
+networks:
+  nocodb-network:
+    external: true
+    name: nocodb-network