feat: v0.2.2, auto find PIV slot id

src/config.rs

@@ -72,6 +72,10 @@ impl TinyEncryptConfig {
         Ok(config)
     }
 
+    pub fn find_by_kid(&self, kid: &str) -> Option<&TinyEncryptConfigEnvelop> {
+        self.envelops.iter().find(|e| e.kid == kid)
+    }
+
     pub fn find_envelops(&self, profile: &Option<String>) -> XResult<Vec<&TinyEncryptConfigEnvelop>> {
         let profile = profile.as_ref().map(String::as_str).unwrap_or("default");
         debugging!("Profile: {}", profile);