Add Docker deployment configuration

- Add Dockerfile for production (multi-stage build)
- Add Dockerfile.dev for development with hot reload
- Add docker-compose.yml with 5 services (web, mariadb, redis, celery-worker, celery-beat)
- Add docker-compose.dev.yml for development overrides
- Add .dockerignore for optimized builds
- Add docker/entrypoint.sh startup script
- Add .env.docker.example template
- Add Makefile for common commands
- Add deploy.sh for one-command deployment
- Update config/settings/selfhosted.py to support MariaDB via DATABASE_URL
- Add mysqlclient to requirements.txt for MariaDB support
- Update .gitignore to exclude .env.docker

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docker-compose.dev.yml

@@ -0,0 +1,54 @@
+version: '3.8'
+
+# =================================================================
+# Development Overrides
+# Use with: docker-compose -f docker-compose.yml -f docker-compose.dev.yml up
+# =================================================================
+
+services:
+  # Web service overrides for development
+  web:
+    build:
+      context: .
+      dockerfile: Dockerfile.dev
+    volumes:
+      # Mount source code for live reload
+      - ./:/app
+      # Override media and static with the same mounts
+      - ./media:/app/media
+      - static_files:/app/staticfiles
+    environment:
+      # Enable debug mode
+      DEBUG: "True"
+      # Use development settings (optional - can still use selfhosted)
+      DJANGO_SETTINGS_MODULE: config.settings.development
+    command: runserver
+    # Remove healthcheck in dev mode (optional)
+    healthcheck:
+      disable: true
+
+  # Celery worker overrides for development
+  celery-worker:
+    build:
+      context: .
+      dockerfile: Dockerfile.dev
+    volumes:
+      # Mount source code for live reload
+      - ./:/app
+    environment:
+      DEBUG: "True"
+      DJANGO_SETTINGS_MODULE: config.settings.development
+
+  # Celery beat overrides for development
+  celery-beat:
+    build:
+      context: .
+      dockerfile: Dockerfile.dev
+    volumes:
+      # Mount source code for live reload
+      - ./:/app
+    environment:
+      DEBUG: "True"
+      DJANGO_SETTINGS_MODULE: config.settings.development
+
+# Note: mariadb and redis services inherit from base docker-compose.yml