refactor: standardize tasks’ name

roles/mastodon/tasks/yarn.yml

@@ -7,12 +7,12 @@
     mode: 0644
     force: true
 
-- name: Gpg dearmor key
+- name: Dearmor gpg key
   ansible.builtin.command:
     cmd: "gpg --dearmor --yes -o {{ mastodon_yarn_key_path }} /tmp/yarn.gpg.key"
   changed_when: true
 
-- name: Yarn source repo
+- name: Set yarn source repo
   ansible.builtin.copy:
     content: "deb [signed-by={{ mastodon_yarn_key_path }}] https://dl.yarnpkg.com/debian stable main"
     dest: /etc/apt/sources.list.d/yarn.list