updated .drone.yml

.drone.yml

@@ -59,6 +59,11 @@ steps:
       - apt-get install -y libzmq3-dev libnftnl-dev libmnl-dev
       - cargo build --verbose --all
       - cargo test --verbose --all
+    volumes:
+    - name: cargo
+      path: /drone/src/.cargo
+    - name: apt
+      path: /var/cache/apt
     when:
       event: push
   - name: release
@@ -84,4 +89,11 @@ steps:
     environment:
       PLUGIN_TITLE: ""
     when:
-      event: tag
+      event: tag
+volumes:
+- name: cargo
+  host:
+    path: /tmp/drone/cache/cargo
+- name: apt
+  host:
+    path: /tmp/drone/cache/apt