test: improve config-file permission test coverage #1436

Job	Run time
Build slim tarball	1m 30s
x86_64-darwin: with shared libraries	2h 55m 12s
aarch64-linux: with shared libraries	1h 49m 42s
aarch64-darwin: with shared libraries	1h 5m 9s
x86_64-linux: with shared libraries	1h 53m 28s
	7h 45m 1s

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