Fix context values in kubeconfig

Fixes: #1014

ansible/roles/setup-kubernetes/tasks/k3s.yml

@@ -26,15 +26,14 @@
     line: "    server: https://{{ ip_address }}:6443"
     insertafter: "- cluster:"
 
-- name: Replace clustername in kubeconfig context section
+- name: Replace all "default" occurrences with clustername in kubeconfig
   tags:
     - k3s
     - kubeconfig
-  lineinfile:
-    dest: "/etc/rancher/k3s/k3s.yaml"
-    state: present
-    regexp: "^    cluster: default"
-    line: "    cluster: {{ inventory_hostname }}"
+  replace:
+    path: /etc/rancher/k3s/k3s.yaml
+    regexp: ': default$'
+    replace: ': {{ inventory_hostname }}'
 
 - name: Replace clustername in kubeconfig cluster section
   tags:
@@ -43,10 +42,9 @@
   lineinfile:
     dest: "/etc/rancher/k3s/k3s.yaml"
     state: present
-    regexp: "^  name: default"
     line: "  name: {{ inventory_hostname }}"
-    insertbefore: "contexts:"
-    firstmatch: true
+    insertbefore: "^contexts:"
+    firstmatch: yes
 
 
 - name: Set kubeconfig variable