Add explicit environment propagation

src/native.rs

@@ -46,6 +46,14 @@ pub struct NativeClientHello {
     pub supported_user_key_algorithms: Vec<String>,
     pub cached_host_key_fingerprint: Option<String>,
     pub attach_ticket_envelope: Option<Vec<u8>>,
+    #[serde(default)]
+    pub requested_env: Vec<EnvVar>,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct EnvVar {
+    pub name: String,
+    pub value: String,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
@@ -1234,6 +1242,7 @@ mod tests {
             supported_user_key_algorithms: vec!["ssh-ed25519".to_string()],
             cached_host_key_fingerprint: None,
             attach_ticket_envelope: None,
+            requested_env: Vec::new(),
         }
     }