docker-compose can’t set env values automatically

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There is a start.sh script under the application:

scripts/start.sh

#!/bin/bash

source /env/set.sh

env/set.sh content:

#!/bin/bash
export DB_USERNAME=a
export DB_PASSWORD=b

docker-compose.yml

version: '3.4'
services:
  web:
    build: .
    expose:
      - "5000"
    command: scripts/start.sh
    tty: true
    stdin_open: true

After run docker-compose build && docker-compose up, login into the container, the env values had not been set. But should run source /env/set.sh manually.
Why didn’t command: scripts/start.sh work?

Source: StackOverflow