The deploy job gated only on the event/ref, so a docs-only PR into
development (where unit/integration/ui/conformance path-skip) still
redeployed the test contour for nothing. Gate it on the `changes` job
too: deploy only when the Go or UI side changed. `changes` still
defaults both true when the diff is uncomputable, and a workflow/deploy
edit forces both true, so ambiguous or infra changes still deploy.
Ilia Denisov