Simplify postgresql backups

I decided to replace custom backup scheduler with cron.
It is fine for now, maybe later I will merge pg_dumpall with restic to
prevent my SSD from dying faster.

roles/backups/tasks/main.yml

@@ -13,14 +13,12 @@
   become: true
   community.docker.docker_container:
     name: postgresql-backuper-1
-    image: git.comfycamp.space/lumin/postgresql-backuper:v0.0.3
+    image: git.comfycamp.space/lumin/postgres:16.4-bookworm
+    entrypoint: ["sleep"]
+    command: ["infinity"]
     volumes:
       - postgresql-backups:/backups
       - /root/.pgpass:/root/.pgpass:ro
-    env:
-      CUSTOM_ARGS: "-U postgres -h postgresql --no-password"
-      BACKUPS_DIR: /backups
-      BACKUP_INTERVAL: 24h
     networks:
       - name: postgresql
     restart_policy: unless-stopped
@@ -74,11 +72,17 @@
       - prosody:/data/docker/prosody:ro
       - synapse:/data/docker/synapse:ro
       - vaultwarden:/data/docker/vaultwarden:ro
-- name: Configure postgresql cron job
+- name: Copy backup script
+  become: true
+  ansible.builtin.template:
+    src: backup.sh.j2
+    dest: /root/backup.sh
+    mode: "0700"
+    owner: root
+- name: Configure backup job
   become: true
   ansible.builtin.cron:
-    name: restic-postgresql
+    name: backups
     minute: "35"
-    hour: "*/24"
+    hour: "0"
-    job: "docker exec restic-1 restic --repo s3:https://{{ s3_host }}/{{ s3_buckets }} -o s3.bucket-lookup=dns backup /data/postgresql"
+    job: /root/backup.sh
-    user: root

roles/backups/templates/backup.sh.j2

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -e
+
+docker exec postgresql-backuper-1 pg_dumpall -U postgres -h postgresql --no-password -f /backups/postgresql.sql
+docker exec restic-1 restic --repo s3:https://{{ s3_host }}/{{ s3_bucket }} -o s3.bucket-lookup=dns backup /data/postgresql
+docker exec restic-1 restic --repo s3:https://{{ s3_host }}/{{ s3_bucket }} -o s3.bucket-lookup=dns forget --keep-daily 7 --keep-weekly 2

roles/backups/vars/main.yml

@@ -1,3 +1,3 @@
 s3_region: ru-1
 s3_host: s3.ru-1.storage.selcloud.ru
-s3_buckets: cc-backups
+s3_bucket: cc-backups