feat: add php 8.5 support

[ma-04]

https://make.wordpress.org/core/2025/11/21/php-8-5-support-in-wordpress-6-9/

Summary by CodeRabbit

• New Features
  • Added support for PHP 8.5 with Docker images available for both amd64 and arm64 platforms
  • Updated documentation with PHP 8.5 setup and usage instructions

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[coderabbitai]

Walkthrough

This PR adds PHP 8.5 support to the project by extending version matrices in CI/CD workflows, updating build configuration, and revising documentation to reflect the new version availability.

Changes

Cohort / File(s)	Summary
CI/CD Workflows .github/workflows/deploy.yml, .github/workflows/test.yml	Extended PHP version matrices to include 8.5 in build-php and build-openlitespeed jobs; added OpenLiteSpeed matrix entry with lsphp85 mapping.
Build & Documentation build.sh, README.MD	Added PHP 8.5 build command mirroring existing pattern; updated Supported Versions list and added pull/run command examples for php:8.5 image.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• feat: OLS PHP 8.4 support #20: Modifies GitHub Actions workflow matrices and OpenLiteSpeed includes to add support for PHP 8.4, following an identical pattern.
• feat: Add PHP 8.4 support #17: Updates GitHub Actions PHP version matrices, README entries, and build.sh for adding a new PHP minor version support.
• chore(ver): Update OpenLiteSpeed to v1.8.3, feat: Add PHP 8.3 Support (Beta) #16: Modifies GitHub workflow PHP version matrices and OpenLiteSpeed/lsphp include entries to add new PHP versions.

Suggested reviewers

• alaminfirdows

Poem

🐰 Eight-point-five hops into our nest,
With workflows, builds, and docs all blessed—
Matrix lines extended wide,
New PHP versions side by side! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: add php 8.5 support' accurately and concisely summarizes the main change: adding PHP 8.5 support across workflows, build scripts, and documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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