Add -k session to bcachefs unlock command.

src/nyan_system.rs

@@ -145,9 +145,10 @@ pub fn bcachefs_unlock(pass: String, dev: &str) -> Result<bool, ExecCommandError
     use std::io::Read;
     use std::io::Write;
     use std::process::Stdio;
+    // "-k", "session" is important as it stores key in sessyin keyring what allows
+    // system to mount filesystem after switch_root
     let mut child = Command::new("bcachefs")
-        .arg("unlock")
-        .arg(dev)
+    .args(&vec!["unlock", "-k", "session", dev])
         .stdin(Stdio::piped())
         .stdout(Stdio::piped())
         .stderr(Stdio::piped())