ci: route to canonical native arcd labels [self-hosted, linux, <arch>]

Replaces non-canonical scale-set / org-prefixed labels with the
existing labels every arcd host registers with. Matches evo for
amd64 and spark for arm64. No new labels added.

.github/workflows/docker.yml

@@ -14,7 +14,7 @@ jobs:
     uses: hanzoai/.github/.github/workflows/docker-build.yml@main
     with:
       image: ghcr.io/luxfi/dao
-      runner-amd64: luxfi-amd64
-      runner-arm64: luxfi-arm64
-      runner-deploy: lux-deploy-linux-amd64
+      runner-amd64: '["self-hosted","linux","amd64"]'
+      runner-arm64: '["self-hosted","linux","arm64"]'
+      runner-deploy: '["self-hosted","linux","amd64"]'
     secrets: inherit