create datadir on launch (#1674)

* create datadir on launch
* change makedirs to Path.mkdir

lnbits/server.py

@@ -4,6 +4,7 @@ uvloop.install()
 
 import multiprocessing as mp
 import time
+from pathlib import Path
 
 import click
 import uvicorn
@@ -37,6 +38,9 @@ def main(
 ):
     """Launched with `poetry run lnbits` at root level"""
 
+    # create data dir if it does not exist
+    Path(settings.lnbits_data_folder).mkdir(parents=True, exist_ok=True)
+
     set_cli_settings(host=host, port=port, forwarded_allow_ips=forwarded_allow_ips)
 
     # this beautiful beast parses all command line arguments and passes them to the uvicorn server