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Key the file cache on project-relative paths, so a cache survives a c… #35545

Job	Run time
End to end test - e2e/config-file-priority	17s
End to end test - e2e/parallel with space	14s
End to end test - e2e/parallel-custom-config	29s
End to end test - e2e/applied-polyfill-php80	18s
End to end test - e2e/only-option	29s
End to end test - e2e/config-dist-fallback	21s
End to end test - e2e/parallel-unused-skips	17s
End to end test - e2e/parallel-reflection-resolver	17s
End to end test - e2e/applied-auto-import	19s
End to end test - e2e/rules-summary-option	20s
End to end test - e2e/phpstan-container-bootstrap	15s
	3m 36s