added docker support

Dockerfile

@@ -0,0 +1,19 @@
+FROM python:3.13-slim
+
+WORKDIR /app
+
+ENV PYTHONUNBUFFERED=1
+
+RUN apt-get update && apt-get install -y \
+    gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+EXPOSE 8080
+
+CMD ["python", "main.py"]

requirements.txt

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+Flask
+icalendar
+pytz
+python-dotenv
+APScheduler
+requests