container env variables for db

src/app.py

@@ -7,8 +7,17 @@ app = Flask(__name__)
 
 def get_conf():
     '''return settings in settings.yaml file'''
+    settings = dict()
     with open(os.path.dirname(os.path.realpath(__file__))+"/settings.yaml", 'r') as conf_file:
         settings = yaml.safe_load(conf_file)
+    settings["db"] = {
+            "host": os.environ.get('POSTGRES_HOST'),
+            "port": os.environ.get('POSTGRES_PORT'),
+            "database": os.environ.get('POSTGRES_DB'),
+            "user": os.environ.get('POSTGRES_USER'),
+            "password": os.environ.get('POSTGRES_PASSWORD')
+            }
+
     return settings
 
 @app.route('/init')