Basing this action on push to `chart-*` tags doesn't work: the action itself
creates the new release tag, so trying to push the changes to a tag ends up
with the releaser comparing the changes to themself (and failing).
This also renames the chart from "descheduler" to "descheduler-helm-chart", to
avoid confusion with automated releases.
Starting with descheduler v0.18 a release branch will be created for
each descheduler minor release. The release guide has been updated with
the steps to create release branches.
Add a link to the test grid dashboard for automated container image builds,
and documents useful gcloud commands for woking with the staging registry.
This documentation is useful for project maintainers that are creating
releases and publishing container images. The chance of remembering
these commands and links is slim to none. Therefore documenting this
information will be very useful.
