vendure@cli unaware of environment

[Draykee]

Is your feature request related to a problem? Please describe.
Using the npx vendure migrate command ignores configuration for the database. For simple projects this might not be a problem, but for production ready code that is usually configured by environment variables this becomes a problem.

Describe the solution you'd like
A env file parameter. Even better might be an option to configure the CLI once like: vendure env .env.
I image if the vendure cli might support triggering e2e test at one point it might be cool to even configure a test environment like this as well.

Describe alternatives you've considered
I added a JS script to handle that:

const fs = require('fs');
const { spawn } = require('child_process');
const dotenv = require('dotenv');

let args = process.argv.slice(2);

let envFile;
// Add default environment file
if (args.length >= 1) {
    if (fs.existsSync(args[0])) {
        envFile = args[0];
    } else if (fs.existsSync(`.env.${args[0]}`)) {
        envFile = `.env.${args[0]}`;
    }
}

if (!envFile) {
    envFile = '.env';
    args = [envFile, ...args];
}

if (fs.existsSync(envFile)) {
    console.log(`[withEnv]`, `Loading environment from: ${envFile}`);

    dotenv.config({
        path: envFile,
    });
    if (args.length >= 2) {
        const command = args[1];
        const commandArgs = args.slice(2);
        const options = { stdio: 'inherit', shell: true }; // This will allow the child process to use the parent's stdin, stdout, and stderr.

        console.log(`[withEnv]`, `Execute shell command: ${command} ${commandArgs.join(' ')}`);
        const child = spawn(command, commandArgs, options);
        child.on('error', error => {
            console.error(`[withEnv]`, `Failed to start subprocess.`, error);
        });
        child.on('exit', function (code, signal) {
            console.log(`child process exited with code ${code} and signal ${signal}`);
        });
    }
} else {
    console.error(`[withEnv]`, `Environment file: ${envFile} not found!`);
    process.exit(1);
}

Using it like: node dev/spawnWithEnv.js npx vendure migrate