To add your credentials and create a local copy of this:
Create a dockerfile with
write your local configuration files, and add in
copy reader.json /etc/datasift/gnip-reader/reader.json
copy writer.json /etc/datasift/datasift-writer/writer.json
copy historics-reader.json /etc/datasift/historics-reader/reader.json
and then run
docker build .
Make sure you publish this to a private repository if you're going to push it anywhere, since it now contains your credentials.