Add lazy piano transcription and optional leased server worker

scripts/piano/Dockerfile

@@ -0,0 +1,9 @@
+FROM python:3.10-slim
+ENV PYTHONUNBUFFERED=1 PIP_NO_CACHE_DIR=1 OMP_NUM_THREADS=2
+RUN apt-get update && apt-get install -y --no-install-recommends ffmpeg libsndfile1 wget && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install -r requirements.txt
+COPY worker.py .
+VOLUME ["/models"]
+CMD ["python", "worker.py"]