Build profile-gated services so workers do not run stale images (#19)

## Summary

The django deploy sets `COMPOSE_PROFILES` on the **start** step but not on the **build** step, so `docker compose build` skips profile-gated services. `up -d` then reuses whatever image already exists and the container silently keeps running old code.

This adds `COMPOSE_PROFILES` to the build step so it matches the start step. Only affects hosts that set `host_apps.compose_profiles` (today: the `monica_site` dj-queue worker on adama).

## Symptom this fixes

On adama the beta worker image was 20 hours stale while web was current:

| Image | Built | Postgres driver |
|---|---|---|
| `monica_site_beta-web` | today | psycopg 3.3.4 |
| `monica_site_beta-worker` | Aug 8 | psycopg2 2.9.12 |

So the worker crash-looped on LISTEN/NOTIFY (`TypeError: 'list' object is not callable` in `dj_queue/runtime/notify.py`) long after `monica_site` had moved to psycopg3, because its image was never rebuilt.

Branch is merged up with `master`, which already carries the worker auto-start from [#18](#18); the diff here is just the build step.

## Test plan

- [x] Manual `COMPOSE_PROFILES=worker docker compose build worker` on adama produced an image with psycopg 3.3.4 and the notify errors stopped.
- [ ] Beta deploy from this branch recreates the worker with a fresh image, no manual rebuild.
- [ ] Hosts without `compose_profiles` (roslin, ai-server-4080) still build/start web only.Reviewed-on: #19

roles/app-deploy/tasks/django.yml

@@ -65,6 +65,8 @@
     group: "{{ admin_user }}"
     mode: "0600"
 
+# COMPOSE_PROFILES must match the start step below: without it, profile-gated
+# services (e.g. the dj-queue worker) are skipped here and keep a stale image.
 - name: "django[{{ _project }}] build images"
   ansible.builtin.command:
     cmd: "docker compose -f {{ _spec.compose_file }} --env-file .env build"
@@ -72,6 +74,7 @@
   environment:
     COMPOSE_PROJECT_NAME: "{{ _project }}"
     WEB_PORT: "{{ app_item.port }}"
+    COMPOSE_PROFILES: "{{ (app_item.compose_profiles | default([])) | join(',') }}"
   become: true
   become_user: "{{ admin_user }}"
   changed_when: true