Composer Modules Usage

This egg supports easy installation of PHP libraries using Composer.

If a composer.json file exists in your server's root directory, it will be used automatically to install dependencies.
If composer.json is missing, the egg looks for a variable (e.g. COMPOSER_MODULES) with a space-separated list of Composer packages to install.
If neither composer.json nor COMPOSER_MODULES is set, Composer installation is skipped.

Specifying Composer Modules manually:
- Enter the packages in the COMPOSER_MODULES variable in this format:
```
vendor/package[:version_constraint]
```
Examples:
- Latest stable version:
```
symfony/http-foundation 
```
- Specific version or range:
```
monolog/monolog:^2.0 doctrine/orm:~2.10 nesbot/carbon:^2.50 
```
- Multiple packages separated by spaces:
```
symfony/http-foundation:^6.0 monolog/monolog guzzlehttp/guzzle 
```
Notes:
Make sure package names and versions exist on Packagist.
Incorrect inputs can cause installation errors visible in the server console.
Installing many or complex packages can increase startup time.
Composer must be pre-installed in the container environment (this egg includes it)