Provide keyutils with persistence-after-reboot using secret-service #181

Job	Run time
ios_native	23s
ci_non_nix (macos-latest)	28s
ci_nix (linux-native)	25s
msrv_native	14s
ci_non_nix (windows-latest)	1m 41s
ci_nix (sync-secret-service)	33s
ci_nix (linux-native,sync-secret-service)	31s
ci_nix (sync-secret-service,crypto-rust)	34s
ci_nix (sync-secret-service,crypto-openssl)	37s
ci_nix (async-secret-service,tokio,crypto-rust)	45s
ci_nix (async-secret-service,async-io,crypto-rust)	47s
ci_nix (async-secret-service,tokio,crypto-openssl)	46s
ci_nix (async-secret-service,async-io,crypto-openssl)	46s
ci_nix (linux-native-sync-persistent,crypto-rust)	32s
ci_nix (linux-native-sync-persistent,crypto-openssl)	28s
ci_nix (linux-native-async-persistent,tokio,crypto-rust)	45s
ci_nix (linux-native-async-persistent,async-io,crypto-rust)	47s
ci_nix (linux-native-async-persistent,tokio,crypto-openssl)	46s
ci_nix (linux-native-async-persistent,async-io,crypto-openssl)	46s
	12m 34s

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