ci: ensure Types.swift is unchanged

Author: hyochan

.github/workflows/test.yml

@@ -12,7 +12,18 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    
+
+    - name: Generate OpenIAP types
+      run: ./scripts/generate-types.sh
+
+    - name: Ensure Types.swift is unchanged
+      run: |
+        if ! git diff --quiet -- Sources/Models/Types.swift; then
+          echo "::error file=Sources/Models/Types.swift::Types.swift is out of date. Run ./scripts/generate-types.sh and commit the result."
+          git diff -- Sources/Models/Types.swift
+          exit 1
+        fi
+
     - name: Select Xcode
       run: |
         echo "Available Xcode versions:"
@@ -24,4 +35,4 @@ jobs:
       run: swift build
 
     - name: Run tests
-      run: swift test
+      run: swift test