OpenStack single-stack IPv6 support

[mdbooth]

Feature Request

Ignition can fetch metadata from OpenStack's IPv4 metadata endpoint¹. However, since OpenStack Victoria, the metadata service now supports both an IPv4 and an IPv6 endpoint². In single-stack IPv6 environments we only have the IPv6 endpoint, which prevents ignition from fetching metadata.

Environment

OpenStack

Desired Feature

Add support for the IPv6 metadata endpoint to the OpenStack provider.

Other Information

Footnotes

1. https://github.com/coreos/ignition/blob/7548ac6dafbb93fe89baf8853e97b71123cc5aed/internal/providers/openstack/openstack.go#L46-L53 ↩

2. https://docs.openstack.org/nova/2024.1/user/metadata.html ↩

[mdbooth]

/cc @MaysaMacedo