Added volume mounted config to Dockerfile (#39)

Dockerfile

@@ -5,6 +5,11 @@ RUN apt-get update && apt-get install -y build-essential libcurl4-openssl-dev li
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
+ARG config_dir=/config
+RUN mkdir $config_dir
+VOLUME $config_dir
+ENV CONFIG_VOLUME=$config_dir
+
 COPY . .
 
 EXPOSE 5000

app/routes.py

@@ -15,7 +15,7 @@ import waitress
 app.config['APP_ROOT'] = os.getenv('APP_ROOT', os.path.dirname(os.path.abspath(__file__)))
 app.config['STATIC_FOLDER'] = os.getenv('STATIC_FOLDER', os.path.join(app.config['APP_ROOT'], 'static'))
 
-CONFIG_PATH = app.config['STATIC_FOLDER'] + '/config.json'
+CONFIG_PATH = os.getenv('CONFIG_VOLUME', app.config['STATIC_FOLDER']) + '/config.json'
 
 
 @app.before_request
@@ -96,7 +96,7 @@ def config():
         if 'url' not in config_data or not config_data['url']:
             config_data['url'] = request.url_root
 
-        with open(app.config['STATIC_FOLDER'] + '/config.json', 'w') as config_file:
+        with open(CONFIG_PATH, 'w') as config_file:
             config_file.write(json.dumps(config_data, indent=4))
             config_file.close()