feat: add mastodon support directly

roles/mastodon/tasks/yarn.yml

@@ -0,0 +1,22 @@
+---
+
+- name: get yarn gpg url
+  get_url:
+    url: "{{ mastodon_yarn_key_url }}"
+    dest: /tmp/yarn.gpg.key
+
+- name: gpg dearmor key
+  shell: "gpg --dearmor -o {{ mastodon_yarn_key_path }} /tmp/yarn.gpg.key"
+  args:
+    creates: "{{ mastodon_yarn_key_path }}"
+
+- name: yarn source repo
+  copy:
+    content: "deb [signed-by={{ mastodon_yarn_key_path }}] https://dl.yarnpkg.com/debian stable main"
+    dest: /etc/apt/sources.list.d/yarn.list
+
+- name: install yarn
+  apt:
+    name: yarn
+    state: present
+    update_cache: true