Update Dockerfile

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@@ -20,6 +20,11 @@ RUN export COMMANDLINE_ARGS="--skip-torch-cuda-test"
 RUN mkdir -p ~/.cache/pip
 RUN chmod 777 ~/.cache/pip && mkdir -p /root/.cache/pip && sudo chown -R $(whoami):$(whoami) ~/.cache/pip
 
+RUN export PIP_CACHE_DIR=~/pip-cache
+
+RUN mkdir -p ~/pip-cache
+RUN chmod 777 ~/pip-cache && mkdir -p /root/pip-cache && sudo chown -R $(whoami):$(whoami) ~/pip-cache
+
 RUN mkdir -p ~/.local
 RUN chmod 777 ~/.local && mkdir -p /root/.local && sudo chown -R $(whoami):$(whoami) ~/.local
 # WebUIの起動（app.pyを実行）