Install composer dependencies in gitpod

[elidrissidev]

Description (*)

This PR adds a new container to the local and gitpod docker-compose files to be able to install composer dependencies in the install.sh script. I also fixed a couple of container names in gitpod script, since gitpod uses different names prefixed with gitpod-.

Local docker installation not tested.

Fixed Issues (if relevant)

1. Fixes Gitpod deployment fails with class Zend_Cache not found #2961

Manual testing scenarios (*)

1. Creating a new workspace in gitpod should install composer dependencies before trying to install openmage.
2. Composer dependencies should also get installed when running with locally with docker using dev/openmage/install.sh.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)
• Add yourself to contributors list

[elidrissidev]

Also, does anyone know why gitpod link is no longer showing in CI checks?

[Flyingmana]

Also, does anyone know why gitpod link is no longer showing in CI checks?

I dont know about it, but I use the browser extension which adds a button in the top right

[Flyingmana]

works again after a bit of waiting :)

[fballiano]

merged and cherrypicked to v20