optimize for rpi

Dockerfile.pizero

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+# Optimized Dockerfile for Raspberry Pi Zero (ARMv6)
+# Minimal memory footprint and no compilation required
+FROM python:3.11-slim
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    TZ=Europe/Berlin \
+    PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1
+
+# Install only essential runtime dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    tzdata \
+    && rm -rf /var/lib/apt/lists/* \
+    && ln -snf /usr/share/zoneinfo/$TZ /etc/localtime \
+    && echo $TZ > /etc/timezone
+
+# Set working directory
+WORKDIR /app
+
+# Install Python dependencies one by one for better memory management on Pi Zero
+# Using older stable versions that are known to work on ARMv6
+RUN pip install --no-cache-dir fastapi==0.95.2
+RUN pip install --no-cache-dir pydantic==1.10.9
+RUN pip install --no-cache-dir uvicorn==0.22.0
+RUN pip install --no-cache-dir httpx==0.24.1
+RUN pip install --no-cache-dir icalendar==5.0.7
+RUN pip install --no-cache-dir jinja2==3.1.2
+RUN pip install --no-cache-dir apscheduler==3.10.1
+RUN pip install --no-cache-dir pytz==2023.3
+RUN pip install --no-cache-dir python-multipart==0.0.6
+
+# Copy application files
+COPY main.py .
+COPY Vektor-Logo.svg ./
+
+# Create static directory and copy logo
+RUN mkdir -p static && \
+    cp Vektor-Logo.svg static/logo.svg
+
+# Expose port
+EXPOSE 8000
+
+# Run with limited workers and basic asyncio loop for Pi Zero
+CMD ["python", "-m", "uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "1", "--loop", "asyncio"]