Add Dockerfile

Dockerfile

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+# --- Base Image ---
+FROM python:3.11-slim
+
+# --- System dependencies ---
+RUN apt-get update && apt-get install -y \
+    ffmpeg \
+    python3-dev \
+    libffi-dev \
+    libnacl-dev \
+    build-essential \
+ && rm -rf /var/lib/apt/lists/*
+
+# --- Set work directory ---
+WORKDIR /app
+
+# --- Copy requirements ---
+COPY requirements.txt .
+
+# --- Install python dependencies ---
+RUN pip install --no-cache-dir -r requirements.txt
+
+# --- Copy bot code ---
+COPY . .
+
+# --- Set environment variables ---
+ENV PYTHONUNBUFFERED=1
+
+# --- Start bot ---
+CMD ["python", "bot.py"]