chore: Remove PHP 8.1 support

[hussainweb]

PHP 8.1 is no longer supported as of this commit. This change removes its usage from the GitHub Actions workflow, README, and build/clean scripts.

Summary by CodeRabbit

• Chores
  • Discontinued PHP 8.1 support. Removed from Docker build configurations, test matrix, generated tags, and documentation.
  • Updated build and cleanup scripts to remove PHP 8.1 variant handling.
  • Supported versions now focus on PHP 8.2 through 8.5.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request removes PHP 8.1 from the project's continuous integration pipeline, build scripts, and documentation. The matrix is narrowed to support PHP 8.2–8.5, with corresponding updates across the GitHub Actions workflow, build configuration files, and README.

Changes

Cohort / File(s)	Summary
CI/CD and Build Configuration .github/workflows/docker-buildx.yml, build.sh, clean.sh	Removed PHP 8.1 from build matrix, corresponding docker build/push commands, and image cleanup operations. Remaining logic for PHP 8.2–8.5 variants unchanged.
Documentation README.md	Removed PHP 8.1 from the Supported PHP Versions list and dropped associated Docker image tags for Apache and Alpine FPM variants.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• feat: add PHP 8.5 support for all build variants #20: Modifies the same files and PHP version matrix; this PR removes PHP 8.1 support while the related PR adds PHP 8.5 support.

Poem

🐰 A version fades, like morning dew,
PHP 8.1 bids adieu!
The matrix shrinks, eight-two through eight-five,
Cleaner pipelines keep the build alive! 🏗️

🚥 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 'chore: Remove PHP 8.1 support' directly and clearly summarizes the main change across all modified files - removal of PHP 8.1 support from workflows, documentation, and build scripts.
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
• Commit unit tests in branch drop-php81

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