large refactor of code to use venv (in .python) for DEV, to use consistent python versions with PROD, sepcifically flask 2.2.2 to address the deprecation of FLASK_ENV -> replaced with ENV. Fixed up git and dockerignores to be more stringent

main.py

@@ -28,7 +28,7 @@ app = Flask(__name__)
 
 app.config['SQLALCHEMY_DATABASE_URI'] = DB_URL
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
-app.config['ENV'] = os.environ['FLASK_ENV']
+app.config['ENV'] = os.environ['ENV']
 app.config['SECRET_KEY'] = b'my_insecure_PA_token_with_random_2134876adsfjhlkasdf87'
 app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 31536000