chore(ansible:tasks): add condition when setting default SHELL to zsh

  ## what
  - add condition when setting default SHELL to zsh

  ## how

  ## why
  - should check if the current shell is `ZSH`
  - should check if the env `USER` is set
    - when test running the workflow using `act` on a local machine,
      `USER` env doesn't exist

  ## where
  - ./tasks/zsh.yaml

  ## usage

  ## issue or pull request

tasks/zsh.yaml

@@ -64,6 +64,9 @@
   shell:
     cmd: chsh -s /bin/zsh {{ ansible_env.USER }}
   become: true
+  when:
+    - ansible_env.SHELL != '/bin/zsh'
+    - lookup('ansible.builtin.env', 'USER')
   tags:
     - zsh
     - terminal