Fix perms in container install and volumes

Author: ethho

Dockerfile

@@ -1,11 +1,14 @@
 ARG PY_VER=3.9
 ARG IMAGE=jupyter/docker-stacks-foundation
 FROM ${IMAGE}
-USER jovyan
 RUN conda install -y -n base -c conda-forge python=${PY_VER} git graphviz pydot && \
     conda clean -afy
+USER 1000
+VOLUME /src
+WORKDIR /tmp
 COPY --chown=1000:100 ./pyproject.toml ./README.md ./LICENSE.txt /main/
 COPY --chown=1000:100 ./datajoint /main/datajoint
 RUN \
     pip install --no-cache-dir /main && \
     rm -r /main/*
+WORKDIR /src