This build step extends the kubectl
cloud builder for Google Cloud Build.
The default builder has an entry-point script which configures context to the cluster and then launches
the kubectl command with any arguments passed to the builder.
This builder uses the same entry-point script but launches the bash command with any arguments passed
to the builder.
This allows one to execute a bash script with multiple kubectl commands with the
cluster credentials configured.
To build this builder, run the following command in this directory.
$ gcloud builds submit . --config=cloudbuild.yaml