Dearmour apt-key.gpg repo key for kubernetes repo, fixes #86 (#87)

* This is now presented as being ascii-armoured and apt apprently
  cannot handle ascii-armoured files

service/kubernetes/scripts/install.sh

@@ -2,7 +2,7 @@
 set -e
 
 # https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/#install-using-native-package-management (yes, `xenial` is correct even for newer Ubuntu versions)
-curl -fsSLo /etc/apt/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg
+curl -fsSL https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-archive-keyring.gpg
 echo "deb [signed-by=/etc/apt/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" > /etc/apt/sources.list.d/kubernetes.list
 
 curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmour -o /etc/apt/keyrings/docker.gpg