Get the port from the json config

internal/config/config.go

@@ -7,6 +7,7 @@ import (
 
 type Config struct {
 	DB_URL          string   `json:"db_url"`
+	LISTEN_ON       string   `json:"listen_on"`
 	TRUSTED_PROXIES []string `json:"trusted_proxies"`
 	OTLP_ENDPOINT   string   `json:"otlp_endpoint"`
 }

main.go

@@ -74,12 +74,12 @@ func main() {
 	// Use h2c so we can serve HTTP/2 without TLS.
 	p.SetUnencryptedHTTP2(true)
 	s := http.Server{
-		Addr:      ":3001",
+		Addr:      conf.LISTEN_ON,
 		Handler:   instrumentedHandler,
 		Protocols: p,
 	}
 
-	slog.Info("Starting server on :3001")
+	slog.Info("Starting server on " + conf.LISTEN_ON)
 	if err := s.ListenAndServe(); err != nil {
 		slog.Error("Server failed", slog.String("err", err.Error()))
 	}