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tools: add `v8.nix` to Nix diff checker #14636

Job	Run time
Build slim tarball	56s
aarch64-linux: Cache V8 build	22s
x86_64-darwin: with shared libraries / build	38m 59s
x86_64-linux: with shared libraries and perfetto / build	24m 56s
aarch64-darwin: with shared libraries / build	23m 7s
aarch64-linux: with shared boringssl-0.20260929.0 / build	22m 47s
aarch64-linux: with shared openssl-3.6.5 / build	22m 5s
aarch64-linux: with shared openssl-4.0.3 / build	22m 28s
aarch64-linux: with shared openssl-fips-3.5.8 / build	26m 49s
aarch64-linux: with shared openssl-3.5.8 / build	21m 29s
	3h 23m 58s