cluster-api-provider-openstack ✨ New CRD + controller for OpenStackServer (v1alpha1)

What this PR does / why we need it:

A new CRD and controller which will manage the OpenStack servers in the cluster.

#2020 #2021

TODOs:

[x] OpenStackServer API && make generate
[x] openstackserver webook (MVP)
[x] openstackserver_controller: create/delete/adopt instances & ports (MVP)
[x] Migrating Bastion to use the new controller (MVP)
[x] Migrating OpenStackMachine to the new controller (MVP)
[x] Stop storing the bastion spec hash into the OpenStackCluster annotations and watch for changes in Bastion spec, where any change would trigger a bastionDelete.
[x] Switch UserData as a ref
[x] adds unit tests
[x] includes documentation
[ ] squashed commits

Future work that can happen outside this PR:

Stop populating server related status fields for both OpenStackCluster and OpenStackMachine objects, since they now live in OpenStackServer. The fields will be removed for a potential v1.
Optimize SetupWithManager when watching for OpenStackServer, since we are only interested in certain state transition: when the server is deleted, and when the server is ready. For that we probably want to write Predicate functions.

May 07 '24 18:05 EmilienM

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May 07 '24 18:05 netlify[bot]

maybe I'm a bit out of context but why do we move to OpenStackServer instead of OpenStackMachine ?

May 20 '24 19:05 mnaser

maybe I'm a bit out of context but why do we move to OpenStackServer instead of OpenStackMachine ?

Hey @mnaser, have a look at https://github.com/kubernetes-sigs/cluster-api-provider-openstack/pull/2021/ and let us know what you think.

May 20 '24 19:05 EmilienM

Oh, very interesting. Makes a lot of sense. Thanks @EmilienM

May 20 '24 19:05 mnaser