поправил флаги

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"encoding/json"
+	"flag"
 	"html/template"
 	"log/slog"
 	"net/http"
@@ -15,19 +16,17 @@ import (
 var (
 	templates = template.Must(template.ParseFS(tplFS, "tpl/*.gohtml"))
 	packages  = Packages{}
+	bindAddr  = flag.String("bind", ":8080", "Address to bind")
+	config    = flag.String("config", "/etc/pkg/config.json", "Config file path")
 )
 
 func main() {
-	addr := os.Getenv("ADDR")
-	if addr == "" {
-		addr = ":8080"
-	}
 	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, os.Kill)
 	defer cancel()
 
 	cfg := &Config{}
 
-	fp, err := os.Open("./config.json")
+	fp, err := os.Open(*config)
 	if err != nil {
 		panic(err)
 	}
@@ -73,14 +72,14 @@ func main() {
 
 	srv := &http.Server{
 		Handler: h,
-		Addr:    addr,
+		Addr:    *bindAddr,
 	}
 	go func() {
 		<-ctx.Done()
 		srv.Shutdown(context.Background())
 	}()
 
-	logger.Info("server started", slog.String("bind", addr))
+	logger.Info("server started", slog.String("bind", *bindAddr))
 	if err := srv.ListenAndServe(); err != http.ErrServerClosed {
 		panic(err)
 	}