diff --git a/.drone.yml b/.drone.yml
index cefeef0..f4fb8d8 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -16,15 +16,27 @@ steps:
         - go/pkg/mod
         - ~/.cache/go-build
       backend: local
-      cache_key: go-mod-cache-{{ branch }}
+      cache_key: go-mod-cache-${DRONE_BRANCH}
 
   - name: build
     image: golang:1.22
     commands:
+      - echo "==== Before build, go/pkg/mod ===="
+      - ls -lR /go/pkg/mod || echo "/go/pkg/mod not found"
+      - echo "==== Before build, /root/.cache/go-build ===="
+      - ls -lR /root/.cache/go-build || echo "/root/.cache/go-build not found"
+      - echo "==== Before build, /go/.cache/go-build ===="
+      - ls -lR /go/.cache/go-build || echo "/go/.cache/go-build not found"
       - go env -w GO111MODULE=on
       - go env -w GOPROXY=https://goproxy.cn,direct
       - go mod tidy
       - go build -o main.exe .
+      - echo "==== After build, go/pkg/mod ===="
+      - ls -lR /go/pkg/mod || echo "/go/pkg/mod not found"
+      - echo "==== After build, /root/.cache/go-build ===="
+      - ls -lR /root/.cache/go-build || echo "/root/.cache/go-build not found"
+      - echo "==== After build, /go/.cache/go-build ===="
+      - ls -lR /go/.cache/go-build || echo "/go/.cache/go-build not found"
 
   - name: rebuild cache
     image: drillster/drone-volume-cache
@@ -39,7 +51,7 @@ steps:
         - go/pkg/mod
         - ~/.cache/go-build
       backend: local
-      cache_key: go-mod-cache-{{ branch }}
+      cache_key: go-mod-cache-${DRONE_BRANCH}
 
   - name: upload
     image: appleboy/drone-scp