chore: Provide instructions that help to resolve a problem with missi…

…ng keychain (#347)

I found out that certain headless linux systems don't implement keyring.
For example on WSL we can`t use keychain because it is not seted up by
default. User need to install gnome-keyring with pip3, start D-bust
session and unlock keychain. Close
#299

src/common.rs

@@ -1268,7 +1268,7 @@ pub fn save_access_key_to_keychain(
     keyring::Entry::new(&service_name, &format!("{}:{}", account_id, public_key_str))
         .wrap_err("Failed to open keychain")?
         .set_password(key_pair_properties_buf)
-        .wrap_err("Failed to save password to keychain")?;
+        .wrap_err("Failed to save password to keychain. You may need to install the secure keychain package by following this instruction: https://github.com/jaraco/keyring#using-keyring-on-headless-linux-systems")?;
 
     Ok("The data for the access key is saved in the keychain".to_string())
 }