Prepare for fly.io

Dockerfile

@@ -0,0 +1,36 @@
+FROM python:3.9-slim
+
+# Set working directory
+WORKDIR /app
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    FLASK_APP=app.py
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements file first for better caching
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the application
+COPY . .
+
+# Create the SQLite database directory with proper permissions
+RUN mkdir -p /app/instance && chmod 777 /app/instance
+
+# Expose the port the app runs on
+EXPOSE 5000
+
+# Run database migrations on startup
+RUN python -c "from app import app, db; app.app_context().push(); db.create_all()"
+
+# Command to run the application
+CMD ["flask", "run", "--host=0.0.0.0", "--port=5000"]