feat: add production Docker deployment

asr-service/Dockerfile

@@ -1,18 +1,22 @@
 FROM python:3.10-slim
 
+ARG DEBIAN_MIRROR=http://deb.debian.org
+ARG PYPI_INDEX_URL=https://pypi.org/simple
+
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
     PIP_NO_CACHE_DIR=1
 
-RUN apt-get update \
+RUN sed -i "s|http://deb.debian.org|${DEBIAN_MIRROR}|g" /etc/apt/sources.list.d/debian.sources \
+    && apt-get update \
     && apt-get install -y --no-install-recommends ffmpeg libsndfile1 \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
 COPY requirements.txt ./
-RUN pip install --upgrade pip \
-    && pip install torch==2.8.0 torchaudio==2.8.0 --index-url https://download.pytorch.org/whl/cpu \
-    && pip install -r requirements.txt
+RUN pip install --index-url "${PYPI_INDEX_URL}" --upgrade pip
+RUN pip install torch==2.8.0 torchaudio==2.8.0 --index-url https://download.pytorch.org/whl/cpu
+RUN pip install --index-url "${PYPI_INDEX_URL}" -r requirements.txt
 
 COPY app.py ./