Execute perl script in Yii2 Framework by http at localhost (Docker)

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I am able to run my Yii2 Project using Docker at localhost. Now, I need to exec perl script by http request. Perl script is located at root folder. Here are piece of codes, how I try to exec perl script.

public function actionExecPerl()
{
    $path = './script.pl';
    $exec = exec("/usr/bin/perl $path", $output);

    if(is_executable($path)) {
        return 'ok';
    }
    else {
        return 'Unable to call Perl Script';
    }
}

Then, I am trying to execute this script by http, from local address:

http://127.0.0.1:22080/sync/exec-perl

In result, I always get: Unable to call Perl Script

I tried all of possible paths (full path), but didn’t get a result.

Just in case, I share my Docker Configuration file

DockerFile

FROM yiisoftware/yii2-php:7.2-apache

# Change document root for Apache
RUN sed -i -e 's|/app/web|/app/api/web|g' /etc/apache2/sites-available/000-default.conf

docker-compose.yml 

version: '3.2'

services:

  backend:
    build: backend
    ports:
      - 21080:80
    volumes:
      # Re-use local composer cache via host-volume
      - ~/.composer-docker/cache:/root/.composer/cache:delegated
      - ./docker/php/php.ini:/usr/local/etc/php/conf.d/custom.ini
      # Mount source-code for development
      - ./:/app

  api:
    build: api
    ports:
      - 22080:80
    volumes:
      # Re-use local composer cache via host-volume
      - ~/.composer-docker/cache:/root/.composer/cache:delegated
      - ./docker/php/php.ini:/usr/local/etc/php/conf.d/custom.ini
      # Mount source-code for development
      - ./:/app

  mysql:
    image: mysql:latest
    restart: always
    container_name: mysql-sensei
    ports:
      - 3306:3306
    command:
      --default-authentication-plugin=mysql_native_password
      --innodb_flush_method=O_DIRECT
    volumes:
      - ./docker/mysql/dump:/docker-entrypoint-initdb.d
      - ./docker/mysql/my.cnf:/etc/mysql/my.cnf
    environment:
      - MYSQL_ROOT_PASSWORD=secret
      - MYSQL_DATABASE=secret
      - MYSQL_USER=secret
      - MYSQL_PASSWORD=secret

Source: StackOverflow