php-spark/plugins/com.noccy.docker/Commands/DockerBuildCommand.php

<?php

namespace SparkPlug\Com\Noccy\Docker\Commands;

use Spark\Commands\Command;
use SparkPlug;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class DockerBuildCommand extends Command
{
    protected function configure()
    {
        $this->setName("docker:build")
            ->setDescription("Build an image");
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $config = read_config("docker.json");
        print_r($config);
        return Command::SUCCESS;
    }
}