use env var for db

e621_api_cloner.py

@@ -19,7 +19,7 @@ app = Quart(__name__)
 
 @app.before_serving
 async def app_before_serving():
-    db_path = sys.argv[1]
+    db_path = os.environ["DBPATH"]
     app.db = await aiosqlite.connect(db_path)
     app.db.row_factory = sqlite3.Row