Add .gitattributes file #1339

Job	Run time
test / Get base test matrix	4s
test / Prepare matrix for unit tests	5s
test / Prepare matrix for functional tests	3s
test / Functional - WP ${{ matrix.wp }} on PHP ${{ matrix.php }} with ${{ (((matrix.dbtype != 'sqlite') && matrix.mysql) \|\| 'SQLite') }}${{ ((matrix.coverage && ' (with coverage)') \|\| '') }} ${{ ((startsWith(matrix.os, 'windows') && '(Windows)') \|\| '') }} ${{ ((startsWith(matrix.os, 'macos') && '(macOS)') \|\| '') }}	-1s
test / Unit test / PHP 8.0	39s
test / Unit test / PHP 8.2	29s
test / Unit test / PHP 8.5 (with coverage)	29s
test / Unit test / PHP 8.1	35s
test / Unit test / PHP nightly	29s
test / Unit test / PHP 7.4	27s
test / Unit test / PHP 7.3	48s
test / Unit test / PHP 7.2	43s
test / Unit test / PHP 8.4	23s
test / Unit test / PHP 8.3	17s
	5m 30s

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