Add operation conformance smoke CI workflow

Author: mdheller

.github/workflows/operation-conformance.yml

@@ -0,0 +1,26 @@
+name: operation-conformance
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  smoke:
+    name: SourceOS operation conformance smoke
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Run structural smoke validation
+        run: |
+          python3 tools/sourceos_operation_conformance.py \
+            --examples-dir tests/fixtures/workspace-operation \
+            --structural-only