ci: run app/worker/bot builds in parallel and deploy after all complete

All three builds now depend only on clone and run concurrently.
Deploy step waits for all three to finish.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.drone.yml

@@ -26,6 +26,7 @@ steps:
 
   - name: build-worker
     image: plugins/docker
+    depends_on: [clone]
     settings:
       repo: git.samagsteribbe.nl/admin/dragonsstash-worker
       registry: git.samagsteribbe.nl
@@ -40,6 +41,7 @@ steps:
 
   - name: build-bot
     image: plugins/docker
+    depends_on: [clone]
     settings:
       repo: git.samagsteribbe.nl/admin/dragonsstash-bot
       registry: git.samagsteribbe.nl
@@ -54,6 +56,7 @@ steps:
 
   - name: deploy
     image: alpine
+    depends_on: [build-app, build-worker, build-bot]
     environment:
       SSH_KEY:
         from_secret: ssh_key