Update to 0.2.6+v4.5.0

- Upgrade app images to v4.5.0
- Switch from postgres:16 to pgautoupgrade/pgautoupgrade:18-debian for automatic major version upgrades
- Fix PGDATA relative path (add leading /)
- Fix pg_backup.sh restore path to match PGDATA

pg_backup.sh

@@ -10,7 +10,7 @@ function backup {
 }
 
 function restore {
-    cd /var/lib/postgresql/data/
+    cd /var/lib/postgresql/data/pgdata/
     restore_config(){
         # Restore allowed connections
         cat pg_hba.conf.bak > pg_hba.conf