build(ci): run the sbuild orchestrator tests

t/sbuild-all.t covers the deb build path, the staged-architecture scan and the
control-file architecture lists, and nothing ran it in CI.

.github/workflows/genesis-openembedded.yml

@@ -56,5 +56,6 @@ jobs:
         run: |
           prove -v t/build_utils.t
           prove -v t/build_timeout.t
+          prove -v t/sbuild-all.t
           prove -v -It/lib t/genesis_openembedded_release.t
           sudo -E prove -v -It/lib t/genesis_openembedded_consumer.t