Auth fetch verification (cavage) works now

- Verifying inbound requests signed with Cavage are now checked as
  expected
- Fixed a bug where the signature header is not generated correctly
- Extended config to include settings for what requests to verify
- Fixed new server in main not using internal port from config

main.go

@@ -4,6 +4,7 @@ package main
 import (
 	"embed"
 	"flag"
+	"fmt"
 	"path"
 	"time"
 
@@ -163,6 +164,11 @@ func newServer() {
 		}()
 	}
 	log.Info().Msg("Starting public server")
-	public := webpublic.New(":8080", &defaultDuck)
-	public.Start()
+	public := webpublic.New(
+		fmt.Sprintf(":%v", config.GlobalConfig.General.PrivatePort),
+		&defaultDuck,
+	)
+	if err = public.Start(); err != nil {
+		log.Fatal().Err(err).Msg("Failed to start public server")
+	}
 }