Use official MeloTTS Docker install flow

docker/melotts/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9-slim
+FROM python:3.10-slim
 
 ENV PYTHONUNBUFFERED=1
 
@@ -10,8 +10,10 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   libsndfile1 \
   && rm -rf /var/lib/apt/lists/*
 
-RUN pip install --no-cache-dir git+https://github.com/myshell-ai/MeloTTS.git@v0.1.2
+RUN git clone https://github.com/myshell-ai/MeloTTS.git /opt/MeloTTS
+RUN pip install --no-cache-dir -e /opt/MeloTTS
 RUN python -m unidic download
+RUN python /opt/MeloTTS/melo/init_downloads.py
 
 COPY melo_tts_cli.py /opt/realtime-voice-bot/melo_tts_cli.py