refactor: migrate to role-based variable management and blockinfile config

roles/devops/defaults/main.yml

@@ -0,0 +1 @@
+---

roles/devops/tasks/main.yml

@@ -13,12 +13,12 @@
       - kubectx
     state: present
 
-- name: Setup shell aliases
-  lineinfile:
-    path: "{{ lookup('env', 'HOME') }}/.zshrc"
-    line: "{{ item }}"
-    create: yes
-  loop:
-    - alias kc='kubectl'
-    - alias kctx='kubectx'
-    - alias kns='kubens'
+- name: Deploy DevOps aliases
+  blockinfile:
+    path: "{{ archsetup_user_home }}/.zshrc"
+    marker: "# {mark} ANSIBLE MANAGED DEVOPS"
+    block: |
+      # DevOps aliases
+      alias kc="kubectl"
+      alias kctx="kubectx"
+      alias kns="kubens"