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2f2d97b6b5
Fixes #6119 With new stable default hostname feature, any default hostname is disabled until the machine config is available. Talos enters maintenance mode when the default config source is empty, so it doesn't have any machine config available at the moment maintenance service is started. Hostname might be set via different sources, e.g. kernel args or via DHCP before the machine config is available, but if all these sources are not available, hostname won't be set at all. This stops waiting for the hostname, and skips setting any DNS names in the maintenance mode certificate SANs if the hostname is not available. Also adds a regression test via new `--disable-dhcp-hostname` flag to `talosctl cluster create`. Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>