fix: switch default shell, and entrypoint

docker/conda.dockerfile

@@ -13,3 +13,4 @@ RUN apt-get update --fix-missing \
     && echo ". /opt/conda/etc/profile.d/conda.sh" >> ~/.bashrc \
     && echo "conda activate base" >> ~/.bashrc \
     && ln -s /opt/conda/bin/conda /usr/bin/conda
+SHELL ["/bin/bash", "-c"]

docker/spleeter-conda.dockerfile

@@ -10,4 +10,4 @@ RUN mkdir -p /model
 RUN conda install -y -c conda-forge musdb
 RUN conda install -y -c conda-forge ${SPLEETER_PACKAGE}==${SPLEETER_VERSION}
 
-ENTRYPOINT ["/bin/bash", "-c", "spleeter"]
+ENTRYPOINT "source /root/.bashrc && spleeter"