update dockerfile

dockerfile

@@ -1,4 +1,5 @@
 FROM pytorch/pytorch:2.3.1-cuda12.1-cudnn8-runtime
+COPY src/ pdm.lock pyproject.toml README.md /app_build/
 RUN apt-get update -qq && apt-get install -qqy --no-install-recommends \
     make \
     build-essential \
@@ -7,12 +8,9 @@ RUN apt-get update -qq && apt-get install -qqy --no-install-recommends \
     ffmpeg \
     && rm -rf /var/lib/apt/lists/*
 WORKDIR /app_build
-COPY src/ pdm.lock pyproject.toml README.md /app_build/
-RUN pip install pdm
-RUN pdm use $(which python)
-RUN pdm sync
-RUN pip install pytorch-lightning==2.0.3 nltk>=3.8.1
-RUN python -m nltk.downloader averaged_perceptron_tagger && \
-    python -m nltk.downloader cmudict
-RUN pdm cache clear
+RUN pip install pdm pytorch-lightning==2.0.3 nltk>=3.8.1 && \
+    pdm use $(which python) && \
+    pdm sync && \
+    pdm cache clear && pip cache purge
+RUN python -m nltk.downloader averaged_perceptron_tagger && python -m nltk.downloader cmudict
 WORKDIR /workspace