Try using postgres service

.gitlab-ci.yml

@@ -3,6 +3,12 @@ variables:
   LANG: 'en_US.UTF-8'
   LC_ALL: 'en_US.UTF-8'
   LANGUAGE: 'en_US.UTF-8'
+  POSTGRES_DB: re2o
+  POSTGRES_USER: re2o
+  POSTGRES_PASSWORD: re2o
+
+services:
+  - postgres:latest
 
 image: debian:stretch
 stages:

install_re2o.sh

@@ -839,9 +839,8 @@ main_function() {
 
         ci-setup )
             install_requirements
-            install_database 2 1 re2o re2o re2o
             install_ldap 1 re2o "dc=example,dc=net"
-            write_settings_file 2 localhost re2o re2o re2o \
+            write_settings_file 2 postgres re2o re2o re2o \
                 "cn=admin,dc=example,dc=net" 2 re2o localhost "dc=example,dc=net" \
                 "mailserver.example.net" 25 "example.net" "re2o.example.net"
             update_django