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

pa_job_manager.py

@@ -50,7 +50,7 @@ import uuid
 
 
 # global debug setting
-if 'FLASK_ENV' not in os.environ or os.environ['FLASK_ENV'] != "production":
+if 'ENV' not in os.environ or os.environ['ENV'] != "production":
     DEBUG=True
 else:
     DEBUG=False