Got gunicorn working. Problem with sqlite intiailization to fix.

Dockerfile

@@ -38,4 +38,4 @@ COPY --from=builder /usr/local /usr/local
 USER myuser
 
 # Start gunicorn with the appropriate options
-CMD ["gunicorn", "-b", "0.0.0.0:5000", "--workers=3", "app:app"]
+CMD ["gunicorn", "-b", "0.0.0.0:3000", "--log-level=debug", "--workers=3", "app:create_app('default')"]

app.py

@@ -6,10 +6,12 @@ from pywebpush import webpush, WebPushException
 import json
 import os
 
+def create_app(config_name):
     app = Flask(__name__)
     app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///webpush.db'
     db.init_app(app)
 
+
     def generate_and_save_vapid_keys():
         vapid = Vapid()
         vapid.generate_keys()
@@ -21,11 +23,11 @@ def generate_and_save_vapid_keys():
         db.session.commit()
 
 
-@app.before_first_request
     def initialize():
         if not VAPIDKey.query.first():
             generate_and_save_vapid_keys()
 
+
     def send_push_notification(subscription_info, message, vapid_key):
         try:
             webpush(
@@ -90,6 +92,4 @@ def unsubscribe():
         else:
             return jsonify(success=False, error="Subscription not found"), 404
 
-    
-if __name__ == '__main__':
-    app.run(debug=True)
+    return app

requirements.txt

@@ -1,4 +1,5 @@
-flask
+flask>=2.0.0
 flask_sqlalchemy
 py_vapid
 pywebpush
+gunicorn