Add simple test workflow to debug trigger

Author: Nicki Nixon

.github/workflows/sdk-generation-validation-simple.yml

@@ -0,0 +1,14 @@
+name: SDK Generation Validation Simple
+
+on:
+  pull_request:
+    paths: 
+      - 'openapi/mx_platform_api.yml'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Test step
+        run: echo "Hello world"