fix(ekko): store service name and add fallback for Server header

The name parameter passed to ekko.New() was never stored on the struct,
causing the HTTP Server header to be malformed (e.g. "/vdev-snapshot+hash"
instead of "warmform/vdev-snapshot+hash").

Store the name in the struct literal and add a fallback that derives the
name from debug.ReadBuildInfo() if an empty string is passed.

ekko/ekko.go

@@ -34,6 +34,8 @@ import (
 	"fmt"
 	"net"
 	"net/http"
+	"runtime/debug"
+	"strings"
 	"time"
 
 	"github.com/labstack/echo-contrib/echoprometheus"
@@ -70,6 +72,7 @@ import (
 //   - WithGzipConfig(): Custom gzip compression settings
 func New(name string, options ...func(*Ekko)) (*Ekko, error) {
 	ek := &Ekko{
+		name:              name,
 		writeTimeout:      60 * time.Second,
 		readHeaderTimeout: 30 * time.Second,
 	}
@@ -77,6 +80,20 @@ func New(name string, options ...func(*Ekko)) (*Ekko, error) {
 	for _, o := range options {
 		o(ek)
 	}
+
+	if ek.name == "" {
+		if bi, ok := debug.ReadBuildInfo(); ok && bi.Main.Path != "" {
+			if idx := strings.LastIndex(bi.Main.Path, "/"); idx >= 0 {
+				ek.name = bi.Main.Path[idx+1:]
+			} else {
+				ek.name = bi.Main.Path
+			}
+		}
+		if ek.name == "" {
+			ek.name = "ekko-app"
+		}
+	}
+
 	return ek, nil
 }