Add minimal test workflow

.github/workflows/test-simple.yml

@@ -0,0 +1,16 @@
+name: Test Simple Workflow
+
+on:
+  workflow_dispatch:
+    inputs:
+      test:
+        description: 'Test'
+        required: false
+        type: string
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Echo
+        run: echo "Test input: ${{ inputs.test }}"