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-build-cache 卷
- 新增了主机路径缓存，提高 CI

.drone.yml

@@ -5,6 +5,11 @@ name: default
 steps:
   - name: restore cache
     image: drillster/drone-volume-cache
+    volumes:
+      - name: go-mod-cache
+        path: /go/pkg/mod
+      - name: go-build-cache
+        path: /root/.cache/go-build
     settings:
       restore: true
       mount:
@@ -23,6 +28,11 @@ steps:
 
   - name: rebuild cache
     image: drillster/drone-volume-cache
+    volumes:
+      - name: go-mod-cache
+        path: /go/pkg/mod
+      - name: go-build-cache
+        path: /root/.cache/go-build
     settings:
       rebuild: true
       mount:
@@ -57,3 +67,10 @@ steps:
   #       - cd /your/deploy/path/
   #       - chmod +x start.sh
   #       - ./start.sh 
+volumes:
+  - name: go-mod-cache
+    host:
+      path: /opt/drone/cache/go-mod
+  - name: go-build-cache
+    host:
+      path: /opt/drone/cache/go-build