feat: add Docker support with Coolify deployment instructions

.dockerignore

@@ -0,0 +1,10 @@
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.env
+node_modules/
+.git
+.gitignore
+windsurfrules
+Input/

Dockerfile

@@ -0,0 +1,12 @@
+# Use official Python image
+FROM python:3.11-slim
+
+WORKDIR /app
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+EXPOSE 5000
+CMD ["python", "app.py"]

README.md

@@ -1 +1,20 @@
-A simple, editable attendance table with dates as rows and player names (plus guest) as columns. Users can mark their attendance with a click. No login, no user management, just a fast and easy attendance tracker.
+## Sport Attendance Sheet
+
+A simple, editable attendance table with dates as rows and player names (plus guest) as columns. Users can mark their attendance with a click. No login, no user management, just a fast and easy attendance tracker.
+
+### Deploying to Coolify (Docker)
+
+1. **Build and push the Docker image** (or connect your repo to Coolify):
+   - If using Git: Push this repo to your Git provider and connect it in Coolify.
+   - If building locally:
+     ```sh
+     docker build -t yourusername/sport-attendance-sheet .
+     docker run -p 5000:5000 yourusername/sport-attendance-sheet
+     ```
+2. **Create a new Docker app in Coolify**
+   - Set the port to `5000`.
+   - Ensure persistent storage for `attendance_data.json` if you want data to survive redeploys.
+   - Set environment variable `PORT=5000` if needed.
+
+3. **Access your app**
+   - Once deployed, your app will be available at the URL Coolify provides.

app.py

@@ -43,4 +43,6 @@ def update_data():
     return jsonify({"status": "success"})
 
 if __name__ == '__main__':
-    app.run(debug=True)
+    import os
+    port = int(os.environ.get('PORT', 5000))
+    app.run(host='0.0.0.0', port=port, debug=False)