The half-disk LV pattern affects ~90% of mk-labs VMs. Treating the
fix-up as application-specific (as it was in day1_deploy_honcho.yml)
means future deploys would each carry the same boilerplate, and any
day1 author could forget it.
This commit:
* Adds playbooks/day0_expand_root_lv.yml — standalone day0 step,
targets {{ target | default("all") }}, honors a per-host
expand_root_lv_skip opt-out for multi-LV layouts.
* Adds playbooks/day0_provision.yml — umbrella playbook chaining
day0_linux_baseline + day0_expand_root_lv, so the operator runs
ONE command per new VM.
* Removes expand_root_lv from day1_deploy_honcho.yml — day0 is
assumed complete before day1 begins (cleaner separation of
concerns, matches the convention day1_deploy_semaphore already
follows).
* Updates the role README to document the lifecycle position and
the opt-out flag for hosts with multi-LV plans.
Reclaims the half-disk LV left by the Ubuntu Server autoinstall
template default. Idempotent — no-ops cleanly when there are no free PE
in the VG, and exits the play cleanly on hosts without LVM.
Supports ext4 and xfs. Does not handle partition resize (cloud-utils
growpart) — out of scope for the template fix-up case.
Wired into day1_deploy_honcho.yml ahead of the honcho role so newly
provisioned VMs get the fix-up automatically. Suitable to add to any
day1 playbook by simply listing it before the application role.
