Add 1-3 merge-files to .gitignore #559

Job	Run time
Linter / json-linter	25s
Linter / yaml-linter	5s
PHP-Linter (8.4) / linter	14s
PHP-Linter (8.3) / linter	13s
PHP-Linter (8.5) / linter	12s
Linter / style-linter	-1s
Linter / ecmascript-linter	-1s
Unit tests, PHP 8.4, ubuntu-latest	22s
Unit tests, PHP 8.4, windows-latest	1m 10s
Unit tests, PHP 8.5, windows-latest	1m 21s
Unit tests, PHP 8.5, ubuntu-latest	25s
Unit tests, PHP 8.3, ubuntu-latest	22s
Unit tests, PHP 8.3, windows-latest	1m 24s
Code coverage	10s
Security checks	23s
Quality control	38s
Cleanup artifacts	4s
	7m 26s

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