Add ci settings file for postgresql database

InvenTree/InvenTree/ci_postgresql.py

@@ -0,0 +1,17 @@
+"""
+Configuration file for running tests against a MySQL database.
+"""
+
+from InvenTree.settings import *
+
+# Override the 'test' database
+if 'test' in sys.argv:
+    eprint('InvenTree: Running tests - Using MySQL test database')
+    
+    DATABASES['default'] = {
+        # Ensure postgresql backend is being used
+        'ENGINE': 'django.db.backends.postgresql',
+        'NAME': 'inventree_test_db',
+        'USER': 'postgres',
+        'PASSWORD': '',
+    }