drone add cache

.drone.yml

@@ -4,6 +4,16 @@ type: docker
 name: default
 
 steps:
+  - name: restore-cache
+    image: drillster/drone-volume-cache
+    volumes:
+      - name: cache
+        path: /cache
+    settings:
+      restore: true
+      mount:
+        - ~/.cache/pip
+
   - name: build
     image: plugins/docker:latest
     volumes:
@@ -23,6 +33,15 @@ steps:
       mirror: https://5c492fmo.mirror.aliyuncs.com
       dockerfile: ./Dockerfile
 
+  - name: rebuild-cache
+    image: drillster/drone-volume-cache
+    volumes:
+      - name: cache
+        path: /cache
+    settings:
+      rebuild: true
+      mount:
+        - ~/.cache/pip
 
   - name: scp
     image: appleboy/drone-scp
@@ -86,3 +105,7 @@ volumes:
 - name: dockersock
   host:
     path: /var/run/docker.sock
+
+- name: cache
+  host:
+    path: /tmp/cache