from OpenAPITools/openapi-diff#186

Author: bc-devrev

.github/workflows/openapi-diff.yml

@@ -0,0 +1,21 @@
+on: [pull_request]
+
+name: validate-schema-changes
+jobs:
+  detect-breaking-changes: 
+    runs-on: ubuntu-latest
+    steps: 
+    - name: Check out HEAD rev
+      uses: actions/checkout@v2
+      with:
+        ref: ${{ github.head_ref }}
+        path: head
+    - name: Check out BASE rev
+      uses: actions/checkout@v2
+      with:
+        ref: ${{ github.base_ref }}
+        path: base   
+    - name: Run OpenAPI Diff (from HEAD rev)
+      uses: docker://openapitools/openapi-diff:latest 
+      with:
+        args: --fail-on-incompatible base/schemas/YOUR-SCHEMA.yaml head/schemas/YOUR-SCHEMA.yaml