ci: split build into build+deploy steps

* build with --no-cache of course

.drone.yml

@@ -194,7 +194,21 @@ steps:
   - name: s
     path: /var/run/docker.sock
   commands:
-  - docker-compose up --build -d --remove-orphans --scale homepage=4
+  - docker-compose build --no-cache
+  when:
+    branch: master
+    status: success
+
+- name: deploy
+  pull: always
+  image: tmaier/docker-compose:latest
+  depends_on:
+  - build
+  volumes:
+  - name: s
+    path: /var/run/docker.sock
+  commands:
+  - docker-compose up -d --remove-orphans --scale homepage=4
   when:
     branch: master
     status: success