How to override upload_max_filesize in php.ini in docker image

I have this docker-compose.yml (part of the main file)

services:
my-site:
  build:
    context: .
    dockerfile: Dockerfile
  container_name: my-site
  environment:
    VIRTUAL_HOST: my-site.local
    PHP_INI_SCAN_DIR: "/usr/local/etc/php/custom.d:/usr/local/etc/php/conf.d"
    TZ: Europe/Paris
  ports:
    - "9090:80"
  volumes:
    - ./../myapp:/var/www/my-site
    - ./app/config/custom.php.ini:/usr/local/etc/php/custom.d
phpmyadmin:
   image: phpmyadmin/phpmyadmin
   container_name: phpmyadmin
   hostname: phpmyadmin.local
   ports :
      - "8080:80"
   environment:
      - PMA_HOST=mysql
      - PMA_USER=root
      - PMA_PASSWORD=password
   links:
      - mysql:mysql
   volumes:
      - ./app/config/php.ini:/usr/local/etc/php/php.ini

In webapp cli

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In phpmyadmin cli

enter image description here

Though it’s the same file but it doesn’t load it

And can’t upload a database more than 2MB

enter image description here

How can I change this value upload_max_filesize and post_max_size in php.ini in docker image

Source: Docker Questions