Add 1-3 merge-files to .gitignore #380

Job	Run time
Quality control	44s
Linter / yaml-linter	7s
Linter / json-linter	23s
PHP-Linter (8.4) / linter	12s
PHP-Linter (8.3) / linter	13s
Linter / ecmascript-linter	17s
PHP-Linter (8.5) / linter	11s
Linter / style-linter	-1s
Unit tests, PHP 8.3, ubuntu-latest	19s
Unit tests, PHP 8.5, ubuntu-latest	21s
Unit tests, PHP 8.4, ubuntu-latest	20s
Unit tests, PHP 8.5, windows-latest	55s
Unit tests, PHP 8.3, windows-latest	1m 29s
Unit tests, PHP 8.4, windows-latest	1m 1s
Code coverage	6s
Security checks	25s
Cleanup artifacts	3s
	7m 5s

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