immich: configure backup with backrest

hosts/home-morefine/docker/immich/backrest_hook_begin.sh

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+# run pg_dump
+bash /home/backups/docker/immich/dump_db.sh
+
+# stop immich
+docker compose -f /home/backups/docker/immich/docker-compose.yaml stop

hosts/home-morefine/docker/immich/backrest_hook_end.sh

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+# start immich
+docker compose -f /home/backups/docker/immich/docker-compose.yaml start
+
+# remove temp backup file
+rm -f /srv/backups/pgdumps/immich/pg.dump

hosts/home-morefine/docker/immich/dump_db.sh

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+#!/bin/bash
+set -e
+
+CONTAINER="immich_postgres"
+USER="postgres"
+DB="immich"
+BACKUP_DIR="/srv/backups/pgdumps/immich"
+TMP_FILE="$BACKUP_DIR/pg.dump.tmp"
+FINAL_FILE="$BACKUP_DIR/pg.dump"
+
+echo "Starting [$DB] pg_dump..."
+
+mkdir -p "$BACKUP_DIR"
+
+# remove old backup file
+rm -f "$TMP_FILE" "$FINAL_FILE"
+
+docker exec -t "$CONTAINER" \
+  sh -lc "pg_dump -U $USER -d $DB -Fc -Z 0 --no-owner --no-privileges" \
+  > "$TMP_FILE"
+
+mv "$TMP_FILE" "$FINAL_FILE"
+
+echo "Done: [$DB] backup saved to $FINAL_FILE"