use Debian instead, install root CA certs
use Debian instead, install root CA certs

The busybox image didn't have all the SSL certs making authentication
fail when it went to authenticate against Google.

tobert/cassandra-summit-cfp-review,tobert/cassandra-summit-cfp-review,tobert/cassandra-summit-cfp-review,tobert/cassandra-summit-cfp-review