Create /nas-dashboard directory before syncing compose file

Docker volume mounts may not auto-create mount points inside the
job container. Use mkdir -p to ensure the target directory exists
before copying files.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -242,7 +242,9 @@ jobs:
           fi
 
       - name: Sync runtime compose file
-        run: cp dashboard/docker-compose.yml /nas-dashboard/docker-compose.yml
+        run: |
+          mkdir -p /nas-dashboard
+          cp dashboard/docker-compose.yml /nas-dashboard/docker-compose.yml
 
       - name: Deploy and verify
         run: |