fix: install kubectl in CI before deploy step

The Act runner doesn't have kubectl pre-installed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -35,6 +35,12 @@ jobs:
             VITE_SUPABASE_URL=${{ secrets.VITE_SUPABASE_URL }}
             VITE_SUPABASE_ANON_KEY=${{ secrets.VITE_SUPABASE_ANON_KEY }}
 
+      - name: Install kubectl
+        run: |
+          curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
+          chmod +x kubectl
+          mv kubectl /usr/local/bin/
+
       - name: Deploy to K3s
         run: |
           mkdir -p ~/.kube