Add support for Magento version 2.4.7 and newer

[di-ivanov]

Is your feature request related to a problem? Please describe.
System requirements for Magento 2.4.7 state composer version 2.9.3+ php-cli image currently has a hard coded version of 2.7.0.

Describe the solution you'd like
Update the composer package manager installed in the php-cli image to a version supported by Magento

Describe alternatives you've considered
As a workaround a developer using the images has to manually update composer before every run of composer command, or container start.

// Manually before a composer command is run
composer self-update 2.9.3
// As part of docker-compose.override.yaml
  deploy:
    entrypoint: >
      bash -c "/docker-entrypoint.sh &&
      composer self-update 2.9.3 -q &&
      exec \"$@\"" --

Both of those alternatives are sub-optimal
Additional context

[pawelskowronek]

@di-ivanov you should able to use COMPOSER_VERSION, see this guide https://developer.adobe.com/commerce/cloud-tools/docker/configure/#update-composer-for-docker You might need to update it in couple more places to keep it consistent between dev and cloud environments.

[di-ivanov]

Hi @pawelskowronek I somehow missed this part of the docker-entrypoint.sh, but it works in the same way and is really a workaround and not long term solution. Every time you start a cli container you are doing composer self-update.
This is slow and counterintuitive, the meaningful thing to do is to update the composer to the supported version. A welcome improvement will be to support multiple versions of composer 2.9.3 and 2.2.26 for older instances of Magento. Those should be the two defaults and from there on you can keep the current self-update mechanism.
A note here it will be a lot more efficient if you introduces a wrapper around composer that will check the current used version and only if it doesn't match the one passed through env then run self-upgrade. A lot of times cli container would be run just to run some random php script not related to composer at all, no need to run the self-upgrade every time.