update CI script to use the internal docker image

.gitlab-ci.yml

@@ -17,7 +17,7 @@ stages:
   - deploy
 
 pep8:
-  image: wifasoi/python-pep8:latest
+  image: git-registry.mittelab.org/infra/tryton/commodity-docker/python-pep8:latest
   stage: check
   allow_failure: true
   script:
@@ -42,9 +42,8 @@ test_install:
   variables:
     POSTGRES_DB: $DATABASE_NAME
     POSTGRES_USER: tryton
-  image: python:3.7.0-slim-stretch
-  script:
-    - python3 -m pip install lxml psycopg2
+  image: git-registry.mittelab.org/infra/tryton/commodity-docker/trytond-base:latest
+  script: 
     - python3 setup.py install
     - echo -e "[database]\nuri = postgresql://$POSTGRES_USER:@postgres:5432\n[web]\nlisten=[::]:8000" > trytond.conf
     - export TRYTONPASSFILE=phonypass.notpassword
@@ -52,7 +51,7 @@ test_install:
     - trytond-admin -c trytond.conf -d $DATABASE_NAME -v --all --email r@ndom.peni --update-modules-list
     - trytond-admin -c trytond.conf -d $DATABASE_NAME -v -u $MODULE_NAME --activate-dependencies
 
-install_module:
+.install_module:
   stage: deploy
   environment: staging
   only: