Add a cli interface to choose a configuration (#163)

- [x] add a cli to the webserver to take env variables into account 
- [x] add a cli to the data processing that takes enviromental variable
as a valid source into account
- [x] rework the cli for the reset sql command
- [x] rework the cli for the copying of sql data from one db to another

tests/conftest.py

@@ -7,11 +7,15 @@ from typing import Any
 
 import pytest
 from sqlalchemy.engine import Engine
-from sqlalchemy.orm import Session
+from sqlalchemy.orm import Session, sessionmaker
 
+from aki_prj23_transparenzregister.config.config_template import SQLiteConnectionString
 from aki_prj23_transparenzregister.utils import data_transfer
 from aki_prj23_transparenzregister.utils.sql import entities
-from aki_prj23_transparenzregister.utils.sql.connector import get_session, init_db
+from aki_prj23_transparenzregister.utils.sql.connector import (
+    get_engine,
+    init_db,
+)
 
 
 @pytest.fixture(autouse=True)
@@ -39,7 +43,11 @@ def empty_db() -> Generator[Session, None, None]:
     """Generates a db Session to a sql_lite db."""
     if os.path.exists("test-db.db"):
         os.remove("test-db.db")
-    db = get_session("sqlite:///test-db.db")
+    db = sessionmaker(
+        autocommit=False,
+        autoflush=False,
+        bind=get_engine(SQLiteConnectionString("test-db.db")),
+    )()
     init_db(db)
     yield db
     db.close()