Debian/Ubuntu `apt install yq` is kislyuk/yq (Python, v3.x), incompatible
with the mikefarah v4 syntax the cloud-init repo's provision.sh/deploy.sh
require. Replace the apt package with a pinned mikefarah Go binary, mirroring
the existing tealdeer ARG (latest-or-pin) pattern, multi-arch amd64/arm64.
smoke-test.sh now asserts `yq --version` reports mikefarah so CI catches a
regression. CHANGELOG: Unreleased entry.
pi
9ab9a28458