Fix SERVICE_FQDN variable: use COUCHDB (no port) at top of environment

docker-compose.yml

@@ -3,14 +3,14 @@ services:
     image: couchdb:3
     restart: unless-stopped
     environment:
+      SERVICE_FQDN_COUCHDB:
       COUCHDB_USER: ${COUCHDB_USER:-admin}
       COUCHDB_PASSWORD: ${COUCHDB_PASSWORD:?COUCHDB_PASSWORD must be set}
-      SERVICE_FQDN_COUCHDB_5984:
     volumes:
       - couchdb_data:/opt/couchdb/data
     labels:
       - "traefik.enable=true"
-      - "traefik.http.routers.couchdb.rule=Host(`${SERVICE_FQDN_COUCHDB_5984}`)"
+      - "traefik.http.routers.couchdb.rule=Host(`${SERVICE_FQDN_COUCHDB}`)"
       - "traefik.http.routers.couchdb.entrypoints=https"
       - "traefik.http.routers.couchdb.tls=true"
       - "traefik.http.services.couchdb.loadbalancer.server.port=5984"