ci: install horde-components CI pipeline

[ralflang]

Installs the horde-components-managed CI bootstrap and workflow. The phar is fetched at workflow runtime from COMPONENTS_PHAR_URL (org variable) or the fallback URL; not committed to the repo.

[github-actions]

🔍 CI Results

Overall: ❌ 8/8 lanes failed

TL;DR: ❌ Quality issues: PHPUnit: 18 tests failed; PHPStan: 333 unique errors in 4 lanes.

Summary by PHP Version

PHP	dev	RC
8.2	❌	❌
8.3	❌	❌
8.4	❌	❌
8.5	❌	❌

Quality Metrics

• PHPUnit: 8 failures, 10 errors out of 198 tests in 4 lanes ❌
• PHPStan (advisory): 333 unique errors in 4 lanes ⚠️
• PHP-CS-Fixer: 0 files checked, no issues ✅

❌ Failed Lanes

php8.2-dev

• PHPUnit: 2 failures, 1 error

php8.2-RC

• PHPUnit: ❌ Setup failed (Composer install failed in /tmp/horde-ci/lanes/php8.2-RC/ActiveSync: Your requirements could not be resolved to an installable set of packages.)
• PHPStan: ❌ Setup failed (Composer install failed in /tmp/horde-ci/lanes/php8.2-RC/ActiveSync: Your requirements could not be resolved to an installable set of packages.)

php8.3-dev

• PHPUnit: 2 failures, 3 errors

php8.3-RC

• PHPUnit: ❌ Setup failed (Composer install failed in /tmp/horde-ci/lanes/php8.3-RC/ActiveSync: Your requirements could not be resolved to an installable set of packages.)
• PHPStan: ❌ Setup failed (Composer install failed in /tmp/horde-ci/lanes/php8.3-RC/ActiveSync: Your requirements could not be resolved to an installable set of packages.)

php8.4-dev

• PHPUnit: 2 failures, 3 errors
• PHP-CS-Fixer: ❌ Setup failed (No result file found)

php8.4-RC

• PHPUnit: ❌ Setup failed (Composer install failed in /tmp/horde-ci/lanes/php8.4-RC/ActiveSync: Your requirements could not be resolved to an installable set of packages.)
• PHPStan: ❌ Setup failed (Composer install failed in /tmp/horde-ci/lanes/php8.4-RC/ActiveSync: Your requirements could not be resolved to an installable set of packages.)

php8.5-dev

• PHPUnit: 2 failures, 3 errors

php8.5-RC

• PHPUnit: ❌ Setup failed (Composer install failed in /tmp/horde-ci/lanes/php8.5-RC/ActiveSync: Your requirements could not be resolved to an installable set of packages.)
• PHPStan: ❌ Setup failed (Composer install failed in /tmp/horde-ci/lanes/php8.5-RC/ActiveSync: Your requirements could not be resolved to an installable set of packages.)

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