fix linting (again)

pgadmin-config-creator/Dockerfile

@@ -1,5 +1,6 @@
 FROM python:3.8-alpine
-RUN mkdir -p /{app,config}
+RUN mkdir /app
+RUN mkdir /config
 COPY . /app
 WORKDIR /app
 CMD ["python", "app.py"]

pgadmin-config-creator/app.py

@@ -5,7 +5,7 @@ import time
 with open('/config/servers.json', 'w') as f:
     print("created " + f.name)
     template_string =   ('{"Servers": {"1": {"Name": "DavinciResolve", '
-                        '"Group": "Servers", "Port": 5432, "Username": ''
+                        '"Group": "Servers", "Port": 5432, "Username": '
                         '"postgres", "Host": "postgres", "SSLMode": "prefer", "MaintenanceDB": "postgres"}}}'
                         )
     data = json.loads(template_string)