[MAINT] Github Actions Reunification - `setup-di-compile`

[damienwebdev]

Action: setup-di-compile

Status: 🔴 Refactor — remove embedded PHP setup and checkout
Files: setup-di-compile/action.yml

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Context

Graycore removed setup-di-compile entirely (feat!: remove unmaintained setup-di-compile action, Feb 2026). The mage-os fork retains it but needs the same lean treatment applied to coding-standard (feat(coding-standard)!: remove pr-diff feature and built-in php setup): strip embedded checkout and PHP setup, let calling workflows own those concerns.

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Current problems

Area	Current (mage-os)	Target
php_version / composer_version inputs	Present — drives embedded PHP setup	Remove; caller handles PHP setup
actions/checkout@v3 step	Embedded in action	Remove; caller must checkout
shivammathur/setup-php@v2 step	Embedded in action	Remove
cache-magento mode: 'store'	Uses deprecated mode input	Remove mode: (aligns with action-cache-magento.md)
tj-actions/changed-files@v39	Gates all steps on changed files	Remove — action always runs

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Dependents

Repo	Risk
ryansunxl/mageos-magento2	Uses setup-di-compile — callers must add PHP setup before using the action
mage-os/mageos-magento2	Uses setup-di-compile — same

Removing php_version / composer_version inputs is a breaking change. Coordinate with or open PRs in both repos to add a shivammathur/setup-php@v2 step before the setup-di-compile call.

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Changes needed

1. Remove actions/checkout step — caller is responsible for checkout
2. Remove shivammathur/setup-php@v2 step — caller is responsible for PHP/composer setup
3. Remove php_version and composer_version inputs
4. Remove mode: 'store' from the cache-magento call (after update-cache-magento PR merges)
5. Remove tj-actions/changed-files step and all if: steps.changed-files.outputs.magento_any_changed == 'true' conditions — action always runs unconditionally
6. Open migration PRs in ryansunxl/mageos-magento2 and mage-os/mageos-magento2 before or alongside this change