update Dockerfile

- introduce build arg `VOLUME_DIR`
- fix permissions of the Volume

docker/Dockerfile

@@ -85,14 +85,19 @@ RUN useradd \
   -m \
   -U \
   "${UNAME}"
-USER ${UNAME}
+
+# create volume directory
+ARG VOLUME_DIR=/data
+RUN mkdir -p "${VOLUME_DIR}" \
+  && chown -R "${UNAME}" "${VOLUME_DIR}"
 
 # setup runtime environment
+USER ${UNAME}
 COPY --chown=${UNAME} --from=pyproject-builder ${APPDIR}/${APPNAME} ${APPNAME}
-ENV INVOKEAI_ROOT /data
-ENV TRANSFORMERS_CACHE /data/.cache
+ENV INVOKEAI_ROOT ${VOLUME_DIR}
+ENV TRANSFORMERS_CACHE ${VOLUME_DIR}/.cache
 ENV INVOKE_MODEL_RECONFIGURE "--yes --default_only"
 EXPOSE 9090
 ENTRYPOINT [ "invokeai" ]
 CMD [ "--web", "--host", "0.0.0.0", "--port", "9090" ]
-VOLUME [ "/data" ]
+VOLUME [ "${VOLUME_DIR}" ]