add docker containerization

Dockerfile

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+# Use Python 3.11 slim image
+FROM python:3.11-slim
+
+# Set working directory
+WORKDIR /app
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    FLASK_APP=app.py \
+    FLASK_ENV=production
+
+# Install system dependencies
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        gcc \
+        python3-dev \
+        curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first to leverage Docker cache
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the application
+COPY . .
+
+# Create volume for persistent database storage
+VOLUME ["/app/instance"]
+
+# Run as non-root user
+RUN useradd -m myuser
+RUN chown -R myuser:myuser /app
+USER myuser
+
+# Expose port
+EXPOSE 5000
+
+# Command to run the application
+CMD ["gunicorn", "-c", "gunicorn.conf.py", "app:app"]

docker-compose.yml

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+services:
+  web:
+    build: .
+    ports:
+      - "5000:5000"
+    volumes:
+      - ./instance:/app/instance
+    env_file:
+      - .env
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:5000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s

gunicorn.conf.py

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+# Gunicorn configuration file
+import multiprocessing
+
+# Server socket
+bind = "0.0.0.0:5000"
+backlog = 2048
+
+# Worker processes
+workers = multiprocessing.cpu_count() * 2 + 1
+worker_class = "sync"
+worker_connections = 1000
+timeout = 30
+keepalive = 2
+
+# Logging
+accesslog = "-"
+errorlog = "-"
+loglevel = "info"
+
+# Process naming
+proc_name = "butter-garden"
+
+# Server mechanics
+daemon = False
+pidfile = None
+umask = 0
+user = None
+group = None
+tmp_upload_dir = None
+
+# SSL
+keyfile = None
+certfile = None
+
+# Security
+limit_request_line = 4096
+limit_request_fields = 100
+limit_request_field_size = 8190