Add config for creating Docker images for tagged releases automatically
Add config for creating Docker images for tagged releases automatically

Google Container Registry can be configured to use this file to build
Docker images automatically whenever a new tag is pushed to the repo.
This reduces the amount of work a human needs to do to create a release.

google/certificate-transparency-go,RJPercival/certificate-transparency-go,daviddrysdale/certificate-transparency-go,RJPercival/certificate-transparency-go,daviddrysdale/certificate-transparency-go,RJPercival/certificate-transparency-go,daviddrysdale/certificate-transparency-go,google/certificate-transparency-go,google/certificate-transparency-go