ci: refactor tests to use standard actions

[garak]

This should fix #110 (including the latest 8.5)

[garak]

A few notes on the reason why some tests are changed (after a first failure):

• GDTextSizeCalculator depends on imagettfbbox, and that can vary slightly by font/rendering stack across environments.
• Some tests asserted exact pixel values (e.g. in tests/Calculator/GDTextSizeCalculatorTest.php).
• Some renderer tests compared full SVG strings against fixtures while using live GD measurements (e.g. tests/Render/SvgForTheBadgeRendererTest.php, tests/Render/SvgSocialRenderTest.php), so tiny width drift caused whole-string mismatches.

So tests were changed to reflect intent:

• In tests/Calculator/GDTextSizeCalculatorTest.php, we used assertEqualsWithDelta(...) for metric-sensitive cases.
• In tests/Render/SvgForTheBadgeRendererTest.php and tests/Render/SvgSocialRenderTest.php, we mocked TextSizeCalculatorInterface to keep widths deterministic for fixture comparisons.

Why this is correct:

• We didn’t change badge rendering behaviour intentionally.
• Failures were from environment-dependent measurement noise, not logic regressions.
• These tests are now stable and still verify what they should: renderer layout logic and output structure, without coupling to host-specific font rasterisation quirks.

[Copilot]

Pull request overview

This PR updates the project’s CI to use standard GitHub Actions for PHP setup and Composer installs, enabling the test matrix to run on newer PHP versions (including 8.4 and 8.5) while keeping SVG-rendering tests deterministic across environments.

Changes:

• Refactors GitHub Actions workflows to use shivammathur/setup-php and ramsey/composer-install, and expands the PHPUnit matrix to PHP 8.4 and 8.5.
• Updates renderer tests to mock TextSizeCalculatorInterface (instead of relying on GD/font metrics) for stable fixture comparisons.
• Loosens a couple of GD text width assertions using assertEqualsWithDelta to reduce environment-dependent flakiness.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/Render/SvgSocialRenderTest.php	Replaces GD calculator usage with a mocked TextSizeCalculatorInterface returning stable widths.
tests/Render/SvgForTheBadgeRendererTest.php	Replaces GD calculator usage with a mocked TextSizeCalculatorInterface returning stable widths.
tests/Calculator/GDTextSizeCalculatorTest.php	Uses delta-based float assertions for more stable GD width checks.
.github/workflows/release.yml	Updates checkout action version.
.github/workflows/php.yml	Moves to setup-php + composer-install and expands the PHP test matrix to 8.4/8.5.
.github/workflows/commit-lint.yml	Updates runner version and checkout action version.
.gitattributes	Updates export-ignore rules (e.g., root *.md, compose.yml, doc, test/dev tooling files).

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[JellyBellyDev]

Awesome!!!

LGTM 👍