add a method to get the Endpoint (#540)

Co-authored-by: lynxcat <lynxcatdeng@gmail.com>

src/modules/agent/http/router.go

@@ -18,6 +18,7 @@ func Config(r *gin.Engine) {
 		v1.GET("/ping", ping)
 		v1.GET("/pid", pid)
 		v1.GET("/addr", addr)
+		v1.GET("/endpoint", endpoint)
 
 		v1.GET("/stra", getStrategy)
 		v1.GET("/cached", getLogCached)

src/modules/agent/http/router_endpoint.go

@@ -0,0 +1,10 @@
+package http
+
+import (
+	"github.com/didi/nightingale/src/modules/agent/config"
+	"github.com/gin-gonic/gin"
+)
+
+func endpoint(c *gin.Context) {
+	c.String(200, config.Endpoint)
+}