ci: add github action for short release tags (#754)
ci: add github action for short release tags (#754)

This github action is intended to be run when a new release tag is
published with the form functions/<lang>/<func>/<version>.

It publishes a shorter tag for the same commit with the form
<func>/<version>. This is intended as a convenience and is needed for
the examples in the docs to function properly.
GoogleContainerTools/kpt-functions-catalog,GoogleContainerTools/kpt-functions-catalog,GoogleContainerTools/kpt-functions-catalog,GoogleContainerTools/kpt-functions-catalog,GoogleContainerTools/kpt-functions-catalog