Automate release process for sig-storage-local-static-provisioner
Automate release process for sig-storage-local-static-provisioner

- update periodical jobs to run against latest canary image
- add postsubmit jobs to build image for tagged releases

https://github.com/kubernetes-sigs/sig-storage-local-static-provisioner/issues/9#issuecomment-454254367

GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid