Safari integration tests

The Safari WebDriver does not support accepting insecure certs, so use a real cert.

Tasks :

1. Use real cert rather than self-signed

   1. manage cert using acme.sh

   2. copy .p12 / .pfx file to / from shared file storage

   3. inject .p12 / .pfx credentials via environment

2. Create / delete DNS records

   1. manage DNS records using AWS Java SDK

   2. inject AWS credentials using EC2 instance profile