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>

Dockerfile.dev

@@ -0,0 +1,45 @@
+# ===================================================================
+# Development Dockerfile - Fast builds with development tools
+# ===================================================================
+FROM python:3.12-slim-bookworm
+
+# Install build and runtime dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    default-libmysqlclient-dev \
+    default-mysql-client \
+    pkg-config \
+    curl \
+    vim \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create django user
+RUN useradd -m -u 1000 -s /bin/bash django
+
+# Set working directory
+WORKDIR /app
+
+# Install Python dependencies
+# Note: In dev mode, code is mounted as volume, so we just install deps
+COPY requirements.txt /tmp/
+RUN pip install --no-cache-dir -r /tmp/requirements.txt \
+    && pip install --no-cache-dir mysqlclient gunicorn
+
+# Create directories
+RUN mkdir -p /app/media /app/staticfiles && \
+    chown -R django:django /app
+
+# Switch to django user
+USER django
+
+# Set Python to run in unbuffered mode
+ENV PYTHONUNBUFFERED=1
+
+# Expose port 8000
+EXPOSE 8000
+
+# Entrypoint script handles service startup
+ENTRYPOINT ["/app/docker/entrypoint.sh"]
+
+# Default command for dev is Django runserver
+CMD ["runserver"]