Associates an elastic ip with an ec2 instance, picking a free one from a predefined list
docker brandnetworks/eip-associate --eips eips
Usage: eip-associate --eips eips
-eips="": Comma separated list of elastic ips
-metadata="http://169.254.169.254/latest/meta-data": Meta data endpoint
-pause=5: Number of seconds to pause between retries
-retries=10: Maximum number of retries
docker build -t builder . && docker run builder | docker build -t eip-associate -