added pip cache

.devcontainer/Dockerfile

@@ -3,8 +3,10 @@ FROM python:latest
 ENV CONF=/conf
 
 RUN mkdir $CONF
-
 COPY ./requirements.txt ${CONF}
-RUN find $CONF -name requirements.txt -type f -not -empty -exec pip3 install --upgrade -r {} \;
 
+# RUN useradd --system --uid 1000 --create-home appdaemon
+# USER appdaemon
+
+RUN --mount=type=cache,target=/root/.cache/pip pip install -r ${CONF}/requirements.txt
 RUN pip install git+https://github.com/AppDaemon/appdaemon@dev