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>

.dockerignore

@@ -0,0 +1,66 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+*.egg
+*.egg-info/
+dist/
+build/
+*.log
+
+# Virtual environments
+venv/
+.venv/
+env/
+ENV/
+
+# Django
+db.sqlite3
+*.sqlite3
+staticfiles/
+media/
+
+# Environment files
+.env
+.env.*
+!.env.docker.example
+
+# Git
+.git/
+.gitignore
+.gitattributes
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Docker
+Dockerfile
+Dockerfile.dev
+docker-compose.yml
+docker-compose.dev.yml
+.dockerignore
+
+# Documentation
+README.md
+*.md
+docs/
+
+# CI/CD
+.github/
+.gitlab-ci.yml
+
+# Testing
+.coverage
+htmlcov/
+.pytest_cache/
+.tox/
+
+# OS
+.DS_Store
+Thumbs.db