Fix makefile vendor problem (#533)

Replace #532

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-on: https://gitea.com/gitea/tea/pulls/533
Reviewed-by: John Olheiser <john+gitea@jolheiser.com>
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-committed-by: Lunny Xiao <xiaolunwen@gmail.com>

.drone.yml

@@ -7,13 +7,6 @@ platform:
   arch: amd64
 
 steps:
-- name: vendor
-  pull: always
-  image: golang:1.20
-  environment:
-    GOPROXY: https://goproxy.io # proxy.golang.org is blocked in China, this proxy is not
-  commands:
-  - make vendor # use vendor folder as cache
 
 - name: build
   pull: always