ci(static): read SITE_URL from secrets

Author: Alexis-Gontier

.github/workflows/deploy-ftp.yml

@@ -18,7 +18,7 @@ jobs:
     env:
       SKIP_ENV_VALIDATION: "true"
       # Domaine final — fige les URLs absolues (sitemap, robots, OG) au build.
-      NEXT_PUBLIC_SITE_URL: ${{ vars.SITE_URL }}
+      NEXT_PUBLIC_SITE_URL: ${{ secrets.SITE_URL }}
     steps:
       - uses: actions/checkout@v4