Figure out release strategy

[chuckha]

/kind feature

Describe the solution you'd like
Right now we're using latest and building from HEAD. This is a very bad practice and we should figure out releases for this project.

I'm hoping that the GitHub packing is available now to solve a large part of this issue for us.

Anything else you would like to add:
Don't use latest image tag.

Environment:

• Cluster-api-provider-docker version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

[chuckha]

• Release a v0.1
• Track cluster-api v1alpha1 on our release-0.1 branch (used for integration tests elsewhere)

/assign
/lifecycle active