🧪 Add comprehensive CI/CD testing workflow for phpMyAdmin module (#13)

* 🧪 Add comprehensive CI/CD testing workflow for phpMyAdmin module

* 🔧 Improve MySQL setup and configuration handling in CI workflow

* 🔧 Fix PowerShell variable escaping in phpMyAdmin config generation

* Update .github/workflows/phpmyadmin-test.yml

Co-authored-by: qodo-merge-pro[bot] <151058649+qodo-merge-pro[bot]@users.noreply.github.com>

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Co-authored-by: qodo-merge-pro[bot] <151058649+qodo-merge-pro[bot]@users.noreply.github.com>

Author: N6REJ