do not blindly overwrite kube config (#263)

* do not blindly overwrite kube config

Signed-off-by: Roman Ivanov <me@roivanov.com>

* don't need to check if an existing config exists

Co-authored-by: Derek Nola <derek.nola@suse.com>
Signed-off-by: Roman Ivanov <me@roivanov.com>

roles/k3s_server/tasks/main.yml

@@ -91,9 +91,21 @@
     - name: Copy kubectl config to local machine
       ansible.builtin.fetch:
         src: ~{{ ansible_user }}/.kube/config
-        dest: ~/.kube/config
+        dest: ~/.kube/config.new
         flat: true
 
+    - name: Merge with any existing kube config
+      ansible.builtin.shell: |
+        TFILE=$(mktemp)
+        KUBECONFIG=~/.kube/config:~/.kube/config.new kubectl config view --flatten > ${TFILE}
+        mv ${TFILE} ~/.kube/config
+        rm ~/.kube/config.new
+      delegate_to: 127.0.0.1
+      become: false
+      register: mv_result
+      changed_when:
+        - mv_result.rc == 0
+
 - name: Start other server if any and verify status
   when:
     - (groups['server'] | length) > 1