feat(worker): Add db_worker service with automatic restart and logging

feat(task_overview): Display generated series in task overview
docs(README): Update documentation for background task workers and troubleshooting

docker/docker-compose.dev.yml

@@ -17,6 +17,20 @@ services:
       - ../:/usr/src/app:cached
       # Mount the app log directory so logs are visible on the host at ./logs
       - ../logs:/var/log/rad
+
+  worker:
+    env_file:
+      - ../.env.dev
+    volumes:
+      - ../:/usr/src/app:cached
+      - ../logs:/var/log/rad
+    entrypoint:
+      [
+        "sh",
+        "-c",
+        "python manage.py migrate --noinput && exec python manage.py db_worker",
+      ]
+    command: []
   nginx:
     # Development nginx override: mount a simplified config that does not
     # reference LetsEncrypt certs so the container can start without real