circleci: try to fix the build.

config/docker/danbooru-ci

@@ -6,7 +6,7 @@ ENV PATH $PATH:/usr/local/bin
 
 USER root
 COPY . /app
-RUN chown -R danbooru:danbooru public/ tmp/ config/ log/ db/
+RUN chown -R danbooru:danbooru /app
 
 # install circleci cli tools
 RUN curl -q -o /usr/local/bin/circleci https://circle-downloads.s3.amazonaws.com/releases/build_agent_wrapper/circleci
@@ -14,4 +14,5 @@ RUN chmod +x /usr/local/bin/circleci
 RUN sed -i'' -e 's/run -it/run -i/' /usr/local/bin/circleci
 
 USER danbooru
+RUN git reset --hard master
 RUN bundle install > /dev/null