CC-36444: Use composer cache from host filesystem (speeds baked builds)

[matweew]

Description

• Ticket/Issue: https://spryker.atlassian.net/browse/CC-36444

In CI jobs with builds using baked filesystem we cannot reuse cached folders for composer, which is ~900MB. And the build process downloads all packages every time.

Related resources

CI log with baked docker/sdk up https://github.com/spryker/suite-nonsplit/actions/runs/18718201883/job/53383776766#logs

Change log

• Added script that is executed only in "baked" mode, which pre-populates Docker cache with id=composer by building a temporary image.

Checklist

• I agree with the Code Contribution License Agreement in CONTRIBUTING.md

[matweew]

With additional composer install on CI step and building temporary cache image, the total win is very small 35-37sec, but it adds additional steps and additional complexity. I won't use it in CI.

But it still can be used in the local env or in pipelines where composer files exist already.