ansible: fix postgresql in Docker

* rm /etc/init.d/postgresql
* enable both the meta unit service (postgresql.service)
  and the cluster service (postgresql@15-main.service)

ansible/roles/postgresql/handlers/main.yml

@@ -1,10 +1,6 @@
 ---
 - name: Restart postgresql
-  service:
-    name: postgresql
-    state: restarted
+  include_tasks: restart.yml
 
 - name: Reload postgresql
-  service:
-    name: postgresql
-    state: reloaded
+  include_tasks: reload.yml

ansible/roles/postgresql/tasks/main.yml

@@ -3,12 +3,29 @@
   apt:
     name: postgresql-{{ postgresql_version }}
 
-- name: Start and enable PostgreSQL service
-  service:
+- name: Remove postgresql from init.d (may conflict with systemd service)
+  file:
+    path: /etc/init.d/postgresql
+    state: absent
+  when: is_docker
+
+- name: Update rc.d to reflect init.d removal
+  command:
+    cmd: update-rc.d postgresql remove
+  when: is_docker
+
+- name: Start and enable PostgreSQL meta unit service
+  systemd_service:
     name: postgresql
     state: started
     enabled: true
 
+- name: Start and enable PostgreSQL cluster service
+  systemd_service:
+    name: postgresql@{{ postgresql_version }}-main
+    state: started
+    enabled: true
+
 - name: Set configuration options in postgresql.conf
   lineinfile:
     path: /etc/postgresql/{{ postgresql_version }}/main/postgresql.conf

ansible/roles/postgresql/tasks/reload.yml

@@ -0,0 +1,10 @@
+---
+- name: Reload PostgreSQL meta unit service
+  systemd_service:
+    name: postgresql
+    state: reloaded
+
+- name: Reload PostgreSQL cluster service
+  systemd_service:
+    name: postgresql@{{ postgresql_version }}-main
+    state: reloaded

ansible/roles/postgresql/tasks/restart.yml

@@ -0,0 +1,10 @@
+---
+- name: Restart PostgreSQL meta unit service
+  systemd_service:
+    name: postgresql
+    state: restarted
+
+- name: Restart PostgreSQL cluster service
+  systemd_service:
+    name: postgresql@{{ postgresql_version }}-main
+    state: restarted