[MAINT] Github Actions Reunification - `setup-magento`

[damienwebdev]

Action: setup-magento

Status: 🔴 Needs update
Files: setup-magento/action.yml

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Summary of differences

Area	Graycore (source of truth)	Mage-OS (fork)
Default PHP version	8.4	8.3
Default magento_version	magento/project-community-edition:2.4.8-p3	~2.4.7-p4
composer_auth input	Present	Absent
COMPOSER_AUTH env on composer steps	Present	Absent
Internal action ref	graycoreio/github-actions-magento2/fix-magento-install@main	mage-os/github-actions/fix-magento-install@main

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Dependents (mage-os/github-actions consumers)

No external repos depend on setup-magento directly (per dependents.md).

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Changes needed in mage-os fork

1. Bump default PHP version from 8.3 to 8.4
2. Update default magento_version from ~2.4.7-p4 to magento/project-community-edition:2.4.8-p3
3. Add composer_auth input (required: false, description: "Composer Authentication Credentials")
4. Add COMPOSER_AUTH: ${{ inputs.composer_auth }} env to all relevant composer steps (install, require, etc.)

Internal workflow impact

After this action is updated, _internal-setup-magento.yaml also needs:

• Add MAGENTO_COMPOSER_REPO: "https://mirror.mage-os.org/" workflow-level env var
• Bump actions/checkout from v4 to v6 (two occurrences) and actions/cache from v4 to v5
• Add COMPOSER_AUTH: ${{ secrets.COMPOSER_AUTH }} env to all composer steps
• Add composer_auth: ${{ secrets.COMPOSER_AUTH }} and magento_repository: ${{ env.MAGENTO_COMPOSER_REPO }} inputs to setup-magento step
• Switch cache-magento refs to ./cache-magento and remove mode: inputs (after update-cache-magento PR merges)
• Bump smoke test PHP to 8.4, Composer to v2.8, Magento to 2.4.8-p3

[digitalrisedorset]

Happy to take this one @damienwebdev , thanks

[digitalrisedorset]

@damienwebdev I have explore to adjust the php version in the ci-actions. I see php version mentioned in setup-di-compile/action.yml b/setup-di-compile/action.yml, am I right to change these or should I scope my change as per the requirement in the issue to only change Files: setup-magento/action.yml

[damienwebdev]

@digitalrisedorset just setup-magento/action.yml

[digitalrisedorset]

@damienwebdev that is now ready

[damienwebdev]

@digitalrisedorset your #355 handled the defaults -- but we still need the composer_auth Magento requires it while MageOS does not.