Enhance Docker setup with logging and monitoring features

- Added logging configuration to WSGI for persistent log collection.
- Updated Docker Compose files for local and development environments, including Redis, PostgreSQL, and Grafana services.
- Introduced Promtail configuration for log scraping and integration with Loki.
- Created application log directory in Dockerfile for log persistence.

docker/promtail-config.yml

@@ -0,0 +1,18 @@
+server:
+  http_listen_port: 9080
+  grpc_listen_port: 0
+
+positions:
+  filename: /tmp/positions.yaml
+
+clients:
+  - url: http://loki:3100/loki/api/v1/push
+
+scrape_configs:
+  - job_name: rad_app_logs
+    static_configs:
+      - targets:
+          - localhost
+        labels:
+          job: rad_app
+          __path__: /var/log/rad/*.log