ci(drone): 添加 Go 模块和构建缓存

- 在 restore cache 和 rebuild cache 步骤中添加了 go-mod-cache 和 go

.drone.yml

@@ -21,6 +21,7 @@ steps:
   - name: build
     image: golang:1.22
     commands:
+      - echo "test" > /go/pkg/mod/testfile
       - echo "==== Before build, go/pkg/mod ===="
       - ls -lR /go/pkg/mod || echo "/go/pkg/mod not found"
       - echo "==== Before build, /root/.cache/go-build ===="