[WIP] use Flask 3.0.0 . deprecate using flask-validator

[danhimalplanet]

• update Docker file to use Python 3.11 , since the plan is to use this in a Debian bookworm. But since the plan is to use a Docker instance, maybe the Debian bookworm doesn't matter. Anyway it's a good thing to start using Python 3.11
• added a docker-compose.yaml I use for local development
• 'from flask import Markup' fails. now importing Markup with 'from markupsafe import Markup'. Not sure if that's the right solution
• commented out "load_dotenv(os.environ['DONATE_DOTENV'])" in autoapp.py . Flask appears to load up the .env file without it
• 'from donate.database import db' doesn't work at all. I don't see a db module to import in donate.database. 'from donate.extensions import db' does work. Hope that's ok!
• pypi module flask-validator hasn't been touched in 3 years. flask-validator uses an older version of flask-sqlalchemy. Recent changes to Flask and Werkzeug don't work with the older version of flask-sqlalchemy. I replaced use of flask-validator with sqlalchemy.orm and a more current version of flask_sqlalchemy. Hope it works!
• updated requirements.txt with what I am using with Python 3.11 and Flask 3.0.0.

I did flask db init

(venv) ➜  python-nb-donate git:(danh_fixes) flask db init
[2023-12-01 13:38:55,140] INFO in autoapp: App initialized
Error: Directory migrations already exists and is not empty

After starting Flask, I get the response:

OperationalError
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such table: project
[SQL: SELECT project.id AS project_id, project.name AS project_name, project."desc" AS project_desc, project.goal AS project_goal, project.created_at AS project_created_at, project.updated_at AS project_updated_at 
FROM project 
WHERE project.name != ?]
[parameters: ('General Fund',)]
(Background on this error at: https://sqlalche.me/e/20/e3q8)

So either the code changes I tried are bad, or I don't know how to init the db for development