ci: add deterministic SITL smoke workflow

.github/workflows/sitl-smoke.yml

@@ -0,0 +1,27 @@
+name: Host SITL smoke
+
+on:
+  pull_request:
+  push:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  smoke:
+    name: Deterministic Gazebo command path
+    runs-on: ubuntu-24.04
+    timeout-minutes: 25
+    steps:
+      - name: Check out source
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Check host-SITL contracts
+        run: |
+          python3 -m unittest tools/sitl/test_kaptan_sim.py
+          python3 tools/sitl/world-structure-test.py
+          cargo test --locked -p kaptan-sitl
+
+      - name: Run Docker closed-loop smoke
+        run: tools/sitl/e2e-smoke.sh