switch from tar to custom pg backup format

docker-compose.yml

@@ -66,7 +66,7 @@ services:
     deploy:
       replicas: 0
     command: >
-      bash -c "pg_dump --clean --format=tar --username=$$POSTGRES_USER --host=database $$POSTGRES_DB --file /backup/$$POSTGRES_DB.tar"
+      bash -c "pg_dump --clean --format=custom --username=$$POSTGRES_USER --host=database $$POSTGRES_DB --file /backup/$$POSTGRES_DB.dump"
     networks:
       - stack
 
@@ -79,7 +79,7 @@ services:
     deploy:
       replicas: 0
     command: >
-      bash -c "pg_restore --exit-on-error --clean --create --username=$$POSTGRES_USER --host=database --dbname postgres /restore/$$POSTGRES_DB.tar &&
+      bash -c "pg_restore --exit-on-error --format=custom --clean --create --username=$$POSTGRES_USER --host=database --dbname postgres /restore/$$POSTGRES_DB.dump &&
                psql -U $$POSTGRES_USER --host=database $$POSTGRES_DB -c 'ANALYZE'"
     networks:
       - stack