Build a Docker image from a Container.
Needs a few things:
- When creating the cluster, the access scope for Storage must be "Read Write" (default is Read Only) so the container can push the built images to GCR.
- Node Pools -> Security -> Set access for each API
- https://cloud.google.com/container-registry/docs/access-control#gke
docker build
requires access to the docker daemon, so the deployment bind mounts the host machine's docker socket