This review implement the minor update workflow
which does:
- a noop heat stack deployment to set and refresh
the heat config output.
- download the heat config and put them in a ansible
playbooks
- run the playbooks with the mistral action
It adds actions for the config download and update
deployment
Adds the config download as a library for being call
either, by the client or mistral
Closes-Bug: #1715557
Change-Id: I199b35f865c0e68d28c5ddd82e5b8fe61abb5f33