Merge pull request #44191 from Arhell/pt-update

[pt] Update install-kubeadm.md

Author: k8s-ci-robot

content/pt-br/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md

@@ -133,7 +133,7 @@ Para mais detalhes sobre compatibilidade entre as versões, veja:
 
    ```shell
    sudo apt-get update
-   sudo apt-get install -y apt-transport-https ca-certificates curl
+   sudo apt-get install -y apt-transport-https ca-certificates curl gpg
    ```
 
 2. Faça o download da chave de assinatura pública da Google Cloud: