postgres: add backup script compat for bullseye

postgres/files/pgbackup-bullseye.sh

+#!/bin/sh
+
+for DB in $(sudo -u postgres psql -t -q -A -c "select datname from pg_catalog.pg_database where not datname like 'template%';")
+do
+	sudo -u postgres pg_dump $DB | gzip -c -- > ${DB}.sql.gz
+done
+
+sudo -u postgres pg_dumpall -g -U postgres | gzip -c -- > pg_dumpall.sql.gz
+

postgres/tasks/main.yml

@@ -38,8 +38,8 @@
 
 - name: ensure we have our postgres backup script
   copy:
-    src: pgbackup.sh
-    dest: /usr/local/bin/
+    src: "pgbackup{{ '-bullseye' if ansible_distribution_major_version|int(default=99) > 10 else '' }}.sh"
+    dest: /usr/local/bin/pgbackup.sh
     owner: root
     group: root
     mode: '0755'