Add ECMAScript linter #125

Job	Run time
Linter	1m 19s
Security checks	24s
Quality control	40s
Unit tests, PHP 8.1, windows-latest	53s
Unit tests, PHP 8.1, ubuntu-latest	26s
Unit tests, PHP 8.2, windows-latest	54s
Unit tests, PHP 8.2, ubuntu-latest	25s
Unit tests, PHP 8.3, windows-latest	52s
Unit tests, PHP 8.3, ubuntu-latest	21s
Unit tests, PHP 8.4, windows-latest	46s
Unit tests, PHP 8.4, ubuntu-latest	29s
Code coverage	13s
Cleanup artifacts	2s
	7m 44s

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