Fix Exiftool not being able to get the metadata for compressed SWF files. Exiftool requires Compress::Zlib as an optional dependency to decompress compressed SWF files, but it wasn't in the Docker image. Archive::Zip is required for Zip files and Digest::MD5 for certain other metadata (see "DEPENDENCIES" in exiftool README).
Config
This directory contains configuration files for Danbooru.
To configure your Danbooru instance, copy danbooru_default_config.rb to danbooru_local_config.rb and edit it. See danbooru_default_config.rb for details.
The only file here that end users need to be concerned about is danbooru_default_config.rb. The rest of the files here are internal Rails-related configuration files that end users shouldn't need to edit.