test: make snapshot path matching CWD-agnostic #3407

Job	Run time
Build slim tarball	2m 27s
aarch64-darwin: with shared libraries	58m 26s
x86_64-darwin: with shared libraries	1h 32m 31s
aarch64-linux: with shared libraries	37m 25s
x86_64-linux: with shared libraries	54m 29s
	4h 5m 18s

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