appview: unify host and port into listenaddr

appview/config.go

···
 
 type Config struct {
 	CookieSecret string `env:"TANGLED_COOKIE_SECRET, default=00000000000000000000000000000000"`
-	Hostname     string `env:"TANGLED_HOSTNAME, default=0.0.0.0"`
-	Port         string `env:"TANGLED_PORT, default=3000"`
 	DbPath       string `env:"TANGLED_DB_PATH, default=appview.db"`
+	ListenAddr   string `env:"TANGLED_LISTEN_ADDR, default=0.0.0.0:3000"`
 }
 
 func LoadConfig(ctx context.Context) (*Config, error) {

cmd/appview/main.go

···
 
 import (
 	"context"
-	"fmt"
 	"log"
 	"log/slog"
 	"net/http"
···
 		log.Fatal(err)
 	}
 
-	addr := fmt.Sprintf("%s:%s", c.Hostname, c.Port)
-
-	log.Println("starting server on", addr)
-	log.Println(http.ListenAndServe(addr, state.Router()))
+	log.Println("starting server on", c.ListenAddr)
+	log.Println(http.ListenAndServe(c.ListenAddr, state.Router()))
 }

flake.nix

···
             };
 
             environment = {
-              TANGLED_PORT = "${toString config.services.tangled-appview.port}";
-              TANGLED_HOST = "localhost";
               TANGLED_DB_PATH = "appview.db";
               TANGLED_COOKIE_SECRET = config.services.tangled-appview.cookie_secret;
             };