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

src/context/unshare.rs

@@ -210,7 +210,7 @@ impl UnshareDriver {
         cmd.arg("--").arg("bash").arg("-c").arg(format!(
             "mount -t proc proc /proc; mkdir /dev/pts; mount -t devpts devpts /dev/pts; touch /dev/ptmx; mount --bind /dev/pts/ptmx /dev/ptmx; {} {}",
             program,
-            args.join(" ")
+            args.iter().map(|a| format!("\"{a}\"")).collect::<Vec<_>>().join(" ")
         ));
 
         cmd