Update Dockerfile

Dockerfile

@@ -18,7 +18,7 @@ WORKDIR $HOME/app
 COPY --chown=user . $HOME/app
 
 # Download VOICEVOX Core from latest Release
-RUN curl -sSfL https://github.com/VOICEVOX/voicevox_core/releases/download/0.15.8/download.sh -o download.sh
+RUN curl -sSfL https://github.com/VOICEVOX/voicevox_core/releases/download/0.15.0/download.sh -o download.sh
 RUN sed -i 's|https://jaist.dl.sourceforge.net/project/open-jtalk/Dictionary/open_jtalk_dic-1.11/open_jtalk_dic_utf_8-1.11.tar.gz|https://downloads.sourceforge.net/project/open-jtalk/Dictionary/open_jtalk_dic-1.11/open_jtalk_dic_utf_8-1.11.tar.gz|' download.sh
 
 # Give execution permissions
@@ -28,7 +28,7 @@ RUN chmod +x download.sh
 RUN ./download.sh
 
 # Clone VOICEVOX Engine from Git Repository
-RUN git clone https://github.com/VOICEVOX/voicevox_engine.git
+RUN git clone --branch release-0.15 https://github.com/VOICEVOX/voicevox_engine.git
 
 # Install requirements.txt
 RUN pip install --no-cache-dir --upgrade -r voicevox_engine/requirements.txt