fix(ci): include workflow file in landing page trigger paths

Without this, changes to the workflow file itself do not trigger a new
run, since the path filter only matched Apps/LandingSite/**.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/landing-page.yml

@@ -4,6 +4,7 @@ on:
   push:
     paths:
       - 'Apps/LandingSite/**'
+      - '.github/workflows/landing-page.yml'
     branches: [main]
   release:
     types: [published]