Moved Dockerfile, COPY at the end

This change should prevent re-installation of the dependencies upon
every change of the repository's contents. Typically if Docker detects
that something changed in a layer, all downstream layers are invalidated
and rebuilt.

dockerfiles/Dockerfile

@@ -1,13 +1,18 @@
 ARG BASE=nvidia/cuda:11.8.0-base-ubuntu22.04
 FROM ${BASE}
+
 RUN apt-get update && apt-get upgrade -y
 RUN apt-get install -y --no-install-recommends gcc g++ make python3 python3-dev python3-pip python3-venv python3-wheel espeak-ng libsndfile1-dev && rm -rf /var/lib/apt/lists/*
 RUN pip3 install llvmlite --ignore-installed
 
-WORKDIR /root
-COPY . /root
+# Install Dependencies:
 RUN pip3 install torch torchaudio --extra-index-url https://download.pytorch.org/whl/cu118
 RUN rm -rf /root/.cache/pip
 RUN make install
+
+# Copy TTS repository contents:
+WORKDIR /root
+COPY . /root
+
 ENTRYPOINT ["tts"]
 CMD ["--help"]