add drone config

.drone.yml

@@ -0,0 +1,36 @@
+---
+kind: pipeline
+name: default
+type: docker
+
+platform:
+  os: linux
+  arch: amd64
+
+clone:
+  image: reg.int.it2000.com.cn/devops/git
+  tags: true
+  skip_verify: true
+
+step:
+  - name: build
+      image: reg.int.it2000.com.cn/library/golang:1.15.6-alpine3.12
+      volumes:
+        - name: deps
+          path: /go
+      environment:
+        GO111MODULE: on
+        GOPROXY: https://goproxy.io
+      commands:
+        - go clean
+
+volumes:
+  - name: deps
+    host:
+      path: /opt/go
+  - name: certs
+    host:
+      path: /etc/ssl/certs
+  - name: docker
+    host:
+      path: /var/run/docker.sock