feat: add health hander and healtchek to docker image and update cd pipline for backend

backend/internal/handlers/registry_handlers.go

@@ -10,6 +10,7 @@ import (
 func Register(router *gin.Engine, db *sql.DB) {
 	handler_posts := NewPostHandlers(repositories.NewPostRepository(db))
 	handler_auth := NewAuthHandlers(repositories.NewAuthRepository(db))
+	router.GET("/health", func(c *gin.Context) { c.Status(200) })
 	v1 := router.Group("api/v1")
 	v1.GET("/callback/github", handler_auth.CallbackGithub)
 	v1.GET("/auth/github", handler_auth.LoginGithub)