fix: install kubectl and configure kubeconfig in CI

.gitea/workflows/deploy.yml

@@ -29,6 +29,16 @@ jobs:
           docker push ${{ env.IMAGE }}:${{ github.sha }}
           docker push ${{ env.IMAGE }}:latest
 
+      - name: Install kubectl
+        run: |
+          curl -LO "https://dl.k8s.io/release/$(curl -Ls https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
+          chmod +x kubectl && mv kubectl /usr/local/bin/kubectl
+
+      - name: Configure kubeconfig
+        run: |
+          mkdir -p ~/.kube
+          echo "${{ secrets.KUBECONFIG }}" | base64 -d > ~/.kube/config
+
       - name: Deploy to K3s
         run: |
           kubectl apply -f k8s/namespace.yml