load config from json file

src/main.rs

@@ -67,15 +67,31 @@ async fn alerts(
             jabber.send_message(message).await;
         });
     }
-    
+
     StatusCode::OK.into_response()
 }
 
+#[derive(Deserialize)]
+struct Config {
+    listen_port: u16,
+    jid: String,
+    password: String,
+    muc: String,
+}
+
 #[tokio::main]
 async fn main() {
     // initialize tracing
     tracing_subscriber::fmt::init();
 
+    let config: Config = serde_json::from_str(
+        &std::fs::read_to_string(
+            std::env::args()
+                .skip(1)
+                .next()
+                .expect("Call with config.json")
+        ).expect("read config")
+    ).expect("parse config");
     let jabber = jabber::run(/*secret*/).await;
     let state = AppState {
         jabber,