Update dockerfile to download versions file from s3
Update dockerfile to download versions file from s3

bundler-api is archieved. rake task to regenerate versions file
will upload to this location in s3.

sonalkr132/rubygems.org,rubygems/rubygems.org,rubygems/rubygems.org,rubygems/rubygems.org,rubygems/rubygems.org,sonalkr132/rubygems.org,sonalkr132/rubygems.org,sonalkr132/rubygems.org