ci: disallow changes to these directories

Author: Jiralite

.github/workflows/supported-versions-only.yml

@@ -0,0 +1,12 @@
+name: Check supported API version changes only
+on:
+  push:
+    paths:
+      - rest/v9
+      - rest/v8
+jobs:
+  validate:
+    name: Validate that these files are untouched
+    runs-on: ubuntu-latest
+    steps:
+      - run: exit 1