How to run init script manually in docker-compose?

Question

I have a Windows container on Windows Server 2019 and I am spinning up a PostgreSQL container. I placed my initdb.sql file inside the docker-entrypoint-initdb.d folder, but it does not work on Windows Server 2019 (works on all other machines, Windows 10, Ubuntu, MacOS, and I have converted it to a Windows container on windows for testing as well).

So now, I want to manually run the initdb.sql script inside my docker-compose. I am wondering what the command would be to manually run the initdb.sql script.

My docker compose is:

version: "3"

networks:
  localnetwork:

services:

  postgres_db:
    image: stellirin/postgres-windows:12-1809
    restart: unless-stopped
    environment:
      - POSTGRES_USER=${DB_USER}
      - POSTGRES_PASSWORD=${DB_PASSWORD}
    volumes:
      - .\admin\${ENV:-dev}\dbms\init:C:\docker-entrypoint-initdb.d
    command: <command to run my initdb.sql>
    ports:
      - "5432:5432"
    networks:
      - localnetwork