Copy vendored files to correct location in docker image

Author: Nemo157

dockerfiles/Dockerfile

@@ -77,7 +77,7 @@ COPY --from=build /build/target/release/cratesfyi /usr/local/bin
 COPY static /opt/docsrs/prefix/public_html
 COPY templates /opt/docsrs/templates
 COPY dockerfiles/entrypoint.sh /opt/docsrs/
-COPY vendor vendor/
+COPY vendor /opt/docsrs/vendor
 
 WORKDIR /opt/docsrs
 ENTRYPOINT ["/opt/docsrs/entrypoint.sh"]