Turn of cache dir to save memory.

.drone.yml

@@ -4,11 +4,6 @@ name: default
 steps:
   - name: docker-build
     image: plugins/docker
-    secrets:
-      - source: DOCKER_USER
-        target: username
-      - source: DOCKER_PASS
-        target: password
     settings:
       username:
         from_secret: DOCKER_USER
@@ -16,7 +11,7 @@ steps:
         from_secret: DOCKER_PASS
       repo: mhackspace-python
       dockerfile: ./compose/django/Dockerfile
-      auto_tag: true
+      tags: latest
       repo: docker.digitaloctave.com/do-registry
       registry: docker.digitaloctave.com