🔧(compose) make the LiveKit agents opt-in in the local dev stack

`make run` no longer starts the metadata collector and the
multi-user transcriber. On my machine, this saves about 400 MB
of RAM and almost 2% CPU, out of the 11% the stack uses.
Start them with `make run-agents` when needed.

Disable `METADATA_COLLECTOR_ENABLED` by default in `common.dist` so
the backend does not dispatch jobs to an agent that is not running,
and document how to enable each agent in `developping_locally.md`.

compose.yml

@@ -9,6 +9,8 @@ services:
 
   redis:
     image: redis:5
+    ports:
+      - "6379:6379"
 
   mailcatcher:
     image: sj26/mailcatcher:latest
@@ -271,11 +273,6 @@ services:
       - ./src/agents:/app
       - /app/.venv
 
-  redis-summary:
-    image: redis:5
-    ports:
-      - "6379:6379"
-
   app-summary-dev:
     build:
       context: src/summary
@@ -290,7 +287,7 @@ services:
     volumes:
       - ./src/summary:/app
     depends_on:
-        - redis-summary
+        - redis
 
   celery-summary-transcribe:
     container_name: celery-summary-transcribe
@@ -304,7 +301,7 @@ services:
     volumes:
       - ./src/summary:/app
     depends_on:
-      - redis-summary
+      - redis
       - app-summary-dev
       - garage
     develop:
@@ -324,7 +321,7 @@ services:
     volumes:
       - ./src/summary:/app
     depends_on:
-      - redis-summary
+      - redis
       - app-summary-dev
       - garage
     develop:

env.d/development/summary.dist

@@ -9,6 +9,10 @@ AWS_S3_ACCESS_KEY_ID="meet-access-key"
 AWS_S3_SECRET_ACCESS_KEY="meet-secret-access-key"
 AWS_S3_REGION_NAME="local"
 
+CELERY_BROKER_URL="redis://redis:6379/2"
+CELERY_RESULT_BACKEND="redis://redis:6379/2"
+TASK_TRACKER_REDIS_URL="redis://redis:6379/2"
+
 WHISPERX_BASE_URL="https://configure-your-url.com"
 WHISPERX_ASR_MODEL="large-v2"
 WHISPERX_API_KEY="your-secret-key"