Try to speed up CI

.gitlab-ci.yml

@@ -9,6 +9,10 @@ services:
   - mdillon/postgis:9.6-alpine
 
 variables:
+  # Change pip's cache directory to be inside the project directory since we can
+  # only cache local items.
+  PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+
   DEBUG: 1
 
   POSTGRES_DB: ojusomap
@@ -20,14 +24,24 @@ variables:
   DATABASE_USER: $POSTGRES_USER
   DATABASE_PASSWORD: $POSTGRES_PASSWORD
 
+# This folder is cached between builds
+# http://docs.gitlab.com/ce/ci/yaml/README.html#cache
+cache:
+  paths:
+  - .cache/pip
 
-pytest:
-  stage: test
-  before_script:
+before_script:
+  - apt-get update && cat system-requirements-debian.txt | xargs apt-get install -y
+  - python manage.py collectstatic
+  - python -V
+  - pip install virtualenv
+  - virtualenv venv
+  - source venv/bin/activate
   - pip install -U pip setuptools
   - pip install -r requirements/base.txt
   - pip install -r requirements/test.txt
-    - apt-get update && cat system-requirements-debian.txt | xargs apt-get install -y
-    - python manage.py collectstatic
+
+pytest:
+  stage: test
   script:
     - pytest -v --cov=ojusomap --cov=apps