Run unit tests on CI with postgres

.circleci/config.yml

@@ -67,6 +67,7 @@ jobs:
             pip install --upgrade pip
             pip install tox
             tox -e docker
+            tox -e docker-postgres
       - codecov/upload
 
   test-docker-build:

tox.ini

@@ -49,5 +49,13 @@ commands_pre =
 commands =
     docker-compose run -e TREEHERDER_DEBUG=False backend bash -c "pytest --cov --cov-report=xml tests/ --runslow -p no:unraisableexception"
 
+[testenv:docker-postgres]
+whitelist_externals=
+    docker-compose
+commands_pre =
+    docker-compose build
+commands =
+    docker-compose run -e TREEHERDER_DEBUG=False -e DATABASE_URL=psql://postgres:mozilla1234@localhost/treeherder backend bash -c "pytest --cov --cov-report=xml tests/ --runslow -p no:unraisableexception"
+
 [flake8]
 per-file-ignores = treeherder/model/models.py:E402