Use the steps at below link to setup automated builds via
release-tools.

https://github.com/kubernetes-csi/csi-release-tools

- add release-tools via git subtree
- update Makefile to use the release-tools/make
- add cloudbuild links from release-tools
- update Dockerfile that can be used for multi-arch by release tools
Signed-off-by: kmova <kiran.mova@mayadata.io>