Add 1-3 merge-files to .gitignore #170

Job	Run time
Linter / json-linter	27s
Linter / style-linter	15s
Linter / yaml-linter	5s
PHP-Linter (8.3) / linter	10s
PHP-Linter (8.5) / linter	12s
PHP-Linter (8.4) / linter	14s
Linter / ecmascript-linter	14s
Unit tests, PHP 8.5, windows-latest	56s
Unit tests, PHP 8.4, windows-latest	1m 1s
Unit tests, PHP 8.5, ubuntu-latest	25s
Unit tests, PHP 8.3, ubuntu-latest	26s
Unit tests, PHP 8.4, ubuntu-latest	30s
Unit tests, PHP 8.3, windows-latest	58s
Quality control	37s
Security checks	25s
Code coverage	7s
Cleanup artifacts	6s
	7m 8s

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