Build PHP base images on both arch

[cbeauchesne]

Motivation

Changes

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed and the CI green, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• Anything but tests/ or manifests/ is modified ? I have the approval from R&P team
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added, removed or renamed?
  • Get a review from R&P team

[github-actions]

CODEOWNERS have been resolved as:

utils/build/build_php_base_images.sh                                    @DataDog/system-tests-core
utils/build/docker/php/apt-sources.d/ubuntu.sources                     @DataDog/apm-php @DataDog/system-tests-core
utils/build/docker/php/docker-bake.hcl                                  @DataDog/apm-php @DataDog/system-tests-core

[datadog-official]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

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