fix(bitpoll): update dependency from postgresql to db for service health check

docker-compose.yml

@@ -51,7 +51,7 @@ services:
       context: ./src
     restart: unless-stopped
     depends_on:
-      postgresql:
+      db:
         condition: service_healthy
     environment:
       BITPOLL_SECRET_KEY: ${BITPOLL_SECRET_KEY?:BITPOLL_SECRET_KEY is required!}