Add missing psd-ci workflow caller

Every PSD repo calls the org reusable CI workflow
(PSD401/.github/.github/workflows/reusable-psd-ci.yml@main) on
pull_request and push to main; this file was omitted from the initial
commit by mistake. No CI logic lives in-repo.

Author: krishagel

.github/workflows/psd-ci.yml

@@ -0,0 +1,11 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  psd-ci:
+    uses: PSD401/.github/.github/workflows/reusable-psd-ci.yml@main
+    secrets: inherit