T04: pid on Pty, enter check, one fitted size, folder and exit logs, non-root Linux tests

Cargo.toml

@@ -24,6 +24,9 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 serde_path_to_error = "0.1.20"
 
+[target.'cfg(unix)'.dependencies]
+rustix = { version = "1", default-features = false, features = ["std", "fs"] }
+
 [lints.rust]
 unexpected_cfgs = { level = "warn", check-cfg = ['cfg(feature, values("cargo-clippy"))'] }