Multiple changes:

- deb: can use ppa as dependency
- deb: cross and regular are using parallel nocheck builds
- deb: ephemeral will not pull keyring if no root powers

Cargo.toml

@@ -9,6 +9,7 @@ clap = { version = "4.5.51", features = ["cargo"] }
 cmd_lib = "2.0.0"
 flate2 = "1.1.5"
 serde = { version = "1.0.228", features = ["derive"] }
+libc = "0.2"
 csv = "1.3.0"
 reqwest = { version = "0.12.9", features = ["blocking", "json", "stream"] }
 git2 = "0.20.2"