refactor: docker image layout

docker/spleeter-conda.dockerfile

@@ -0,0 +1,15 @@
+ARG BASE=conda
+ARG SPLEETER_PACKAGE=spleeter
+ARG SPLEETER_VERSION=1.4.9
+
+FROM ${BASE}
+
+ENV MODEL_PATH /model
+
+RUN mkdir -p /model
+COPY audio_example.mp3 .
+
+RUN conda install -y -c conda-forge musdb
+RUN conda install -y -c conda-forge ${SPLEETER_PACKAGE}==${SPLEETER_VERSION}
+
+ENTRYPOINT ["spleeter"]