using docker alpine image for releasing

.drone.yml

@@ -34,7 +34,7 @@ steps:
           - tag
 
   - name: release
-    image: golang
+    image: golang:alpine
     volumes:
       - name: dockersock
         path: /var/run
@@ -48,6 +48,7 @@ steps:
       DOCKER_REGISTRY: quay.io
     commands:
       - sleep 5
+      - apk add --no-cache bash docker
       - curl -sL https://git.io/goreleaser | bash
     depends_on:
       - test