ci(quality): add repo contract workflow

Author: however-yir

.github/workflows/repo-contract-ci.yml

@@ -0,0 +1,19 @@
+name: Repo Contract CI
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  contract:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run repository contract tests
+        run: bash tests/repo_contract_test.sh