Turn of cache dir to save memory.

.drone.yml

@@ -4,6 +4,11 @@ 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
@@ -11,7 +16,7 @@ steps:
         from_secret: DOCKER_PASS
       repo: mhackspace-python
       dockerfile: ./compose/django/Dockerfile
-      tags: latest
+      auto_tag: true
       repo: docker.digitaloctave.com/do-registry
       registry: docker.digitaloctave.com