Adding curl method for kubectl

Author: Heshdude

installers/kubectl/installer.toml

@@ -25,3 +25,10 @@ gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cl
 EOF
 yum install -y kubectl
 """
+
+[curl]
+sh ="""
+@info "Downloading Helm"
+@sudo curl -sSL https://storage.googleapis.com/kubernetes-release/release/v1.13.3/bin/linux/amd64/kubectl -o /usr/local/bin/kubectl
+@sudo chmod +x /usr/local/bin/kubectl
+"""