Update workflow with kubectl installation

.gitea/workflows/deploy-to-k3s.yml

@@ -16,6 +16,14 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Setup kubectl
+        run: |
+          echo "Installing kubectl..."
+          curl -LO "https://dl.k8s.io/release/v1.28.4/bin/linux/amd64/kubectl"
+          chmod +x kubectl
+          mv kubectl /usr/local/bin/
+          kubectl version --client
+
       - name: Deploy to K3s
         run: |
           echo "Deploying to K3s cluster..."