This is my compose.yaml, and i don’t have any .env in my working dir.

services:
  service_a:
    image: "my_img"
    environment:
      - WORKER_NUMBER=1
    stdin_open: true
    tty: true
    command: >
      bash -c "export PATH=/root/miniconda3/bin:$PATH
      && conda init
      && echo "WORKER_NUMBER=${WORKER_NUMBER}
      && tail -f /dev/null"

When i use docker compose up i get a warning:

WARN[0000] The "WORKER_NUMBER" variable is not set. Defaulting to a blank string. 

And the print result is

WORKER_NUMBER=

Why and how to set env var by environment attribute correctly? Thanks for any helps!

My Docker & Docker compose ver:

Server: Docker Engine - Community
 Engine:
  Version:          19.03.15


Docker Compose version v2.27.0