Add 1-3 merge-files to .gitignore #1361

Job	Run time
PHP-Linter (8.5) / linter	14s
PHP-Linter (8.4) / linter	12s
PHP-Linter (8.3) / linter	13s
Linter / yaml-linter	7s
Linter / json-linter	37s
Linter / style-linter	0s
Linter / ecmascript-linter	0s
Unit tests, PHP 8.5, windows-latest	1m 4s
Unit tests, PHP 8.3, ubuntu-latest	24s
Unit tests, PHP 8.4, windows-latest	1m 5s
Unit tests, PHP 8.4, ubuntu-latest	20s
Unit tests, PHP 8.3, windows-latest	1m 5s
Unit tests, PHP 8.5, ubuntu-latest	27s
Security checks	17s
Code coverage	8s
Quality control	39s
Cleanup artifacts	6s
	6m 58s

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