Add testfile to understand workflow files

.github/workflows/test.yml

@@ -0,0 +1,23 @@
+name: Validate Examples
+
+on:
+  push: { branches: [ "main" ] }
+  pull_request: { branches: [ "main" ] }
+
+jobs:
+  verify-file-schemas:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with: { submodules: recursive }
+      - name: create file in data
+        shell: bash -l {0}
+        run: |
+          cd data
+          touch foo.txt
+          ls
+      - name: verify that the file is there
+        shell: bash -l {0}
+        run: |
+            ls