Add 1-3 merge-files to .gitignore #558

Job	Run time
Linter / yaml-linter	6s
PHP-Linter (8.3) / linter	11s
PHP-Linter (8.4) / linter	18s
Linter / json-linter	26s
PHP-Linter (8.5) / linter	12s
Linter / style-linter	0s
Linter / ecmascript-linter	0s
Unit tests, PHP 8.3, windows-latest	1m 12s
Unit tests, PHP 8.4, windows-latest	1m 7s
Unit tests, PHP 8.5, windows-latest	1m 11s
Unit tests, PHP 8.4, ubuntu-latest	21s
Unit tests, PHP 8.3, ubuntu-latest	17s
Unit tests, PHP 8.5, ubuntu-latest	18s
Quality control	35s
Code coverage	10s
Security checks	26s
Cleanup artifacts	6s
	6m 56s

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