Migrate CI from Travis to GitHub Actions

[rick-lam]

Summary

Replaces Travis CI with a GitHub Actions workflow (.github/workflows/ci.yml) and removes .travis.yml.

• Matrix: PHP 7.4, with and without --prefer-lowest — both required to pass (no allowed-failures).
• Pins the Composer platform to the runtime PHP version, then composer update.
• Runs phpcs + phpunit (131 tests). coverage: none (nothing consumes coverage now), so no xdebug — runs in ~15s.
• Caches Composer's download dir, keyed on PHP version + lowest flag + composer.json hash.
• Uses actions/checkout@v5 / actions/cache@v5 (avoids the Node 20 deprecation).
• README: Travis build badge → GitHub Actions badge; dead Scrutinizer coverage/quality badges removed (scrutinizer-ci.com no longer serves ocular.phar — returns 403).

No Composer audit workaround needed: with Symfony 5 (#33), PHPUnit 8.5 (#32), and the mockery ^1.3.1 floor (#35) on master, the full dependency set — including --prefer-lowest — resolves clean with no security advisories.

Verification

Green on PHP 7.4 — both PHP 7.4 and PHP 7.4 (lowest) jobs pass (phpcs + 131 phpunit tests), no run annotations.

Merge note

Master's branch protection still requires the retired continuous-integration/travis-ci status check, so this PR shows BLOCKED. It needs an admin merge — and since this PR is what adds the replacement Actions check, the bypass is the only way to land it. After merging, consider repointing the required check from travis-ci → the PHP 7.4 job.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Migrates the project’s CI pipeline from Travis CI to GitHub Actions, keeping the same high-level checks (PHP_CodeSniffer + PHPUnit + Scrutinizer coverage upload) while removing the Travis configuration and updating documentation badges.

Changes:

• Added a GitHub Actions CI workflow with a PHP matrix (7.3/7.4) and optional --prefer-lowest, including Composer caching and Scrutinizer coverage upload.
• Removed the legacy .travis.yml configuration.
• Updated the README build status badge to point to the new GitHub Actions workflow.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
README.md	Replaces Travis build badge with GitHub Actions workflow badge.
.travis.yml	Removes Travis CI configuration.
.github/workflows/ci.yml	Adds GitHub Actions workflow implementing the CI matrix, lint/test steps, caching, and coverage upload.

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