S allius/issue180 (#265)

* move default_config.toml into src/cnf/.

* improve file handling

* remove obsolete rules

app/Dockerfile

@@ -59,7 +59,6 @@ RUN python -m pip install --no-cache-dir --no-cache --no-index /root/wheels/* &&
 
 # copy the content of the local src and config directory to the working directory
 COPY --chmod=0700 entrypoint.sh /root/entrypoint.sh
-COPY config .
 COPY src .
 RUN echo ${VERSION} > /proxy-version.txt \
   && date > /build-date.txt