♻: add pg role determination to mastodon

roles/mastodon/tasks/db.yml

@@ -0,0 +1,15 @@
+---
+
+- name: Create mastodon db role
+  become_user: postgres
+  become: true
+  community.postgresql.postgresql_user:
+    name: "{{ mastodon_pg_role }}"
+    password: "{{ mastodon_pg_password }}"
+
+- name: Create mastodon db
+  become_user: postgres
+  become: true
+  community.postgresql.postgresql_db:
+    name: "{{ mastodon_pg_database }}"
+    owner: "{{ mastodon_pg_role }}"