postgres: store DB password with other secrets

Let’s uncomplicate our lives. Also I’m not sure if the ~/.pgpass stuff
ever worked properly or even at all.

roles/postgres/tasks/main.yml

@@ -10,32 +10,6 @@
     enabled: true
     state: started
 
-- name: Check for existing database password
-  become: yes
-  become_user: '{{ user }}'
-  slurp:
-    path: '~/.pgpass'
-  register: pgpass
-  failed_when: false
-
-- name: Get database password
-  when: '"content" in pgpass'
-  set_fact: db_password='{{ pgpass.content | b64decode | split(":") | last }}'
-
-- name: Create database password
-  when: '"content" not in pgpass'
-  set_fact: db_password='{{ lookup("password", "/dev/null", chars=["ascii_letters", "digits"]) }}'
-
-- name: Create .pgpass
-  become: yes
-  become_user: '{{ user }}'
-  copy:
-    dest: '~/.pgpass'
-    content: |
-      localhost:5432:{{ user }}:{{ user }}:{{ db_password }}
-    force: no
-    mode: 0600
-
 - become: yes
   become_user: postgres
   block:
@@ -47,8 +21,7 @@
       postgresql_user:
         db: '{{ database | default(user) }}'
         name: '{{ user }}'
-        password: '{{ db_password }}'
-        no_password_changes: '{{ "content" in pgpass }}'
+        password: '{{ password.db_pass }}'
 
     - name: Set schema owner
       postgresql_owner: