Add 1-3 merge-files to .gitignore #532

Job	Run time
Linter / yaml-linter	4s
PHP-Linter (8.4) / linter	13s
Linter / json-linter	21s
Linter / ecmascript-linter	16s
PHP-Linter (8.3) / linter	10s
PHP-Linter (8.5) / linter	10s
Linter / style-linter	0s
Unit tests, PHP 8.3, ubuntu-latest	20s
Unit tests, PHP 8.4, windows-latest	57s
Unit tests, PHP 8.3, windows-latest	1m 4s
Unit tests, PHP 8.4, ubuntu-latest	17s
Unit tests, PHP 8.5, windows-latest	57s
Unit tests, PHP 8.5, ubuntu-latest	20s
Quality control	50s
Security checks	28s
Code coverage	8s
Cleanup artifacts	3s
	6m 38s

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