Add CI step for leverage tier updates

build_helpers/binance_update_lev_tiers.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+import json
+import os
+from pathlib import Path
+
+import ccxt
+
+
+key = os.environ.get('FREQTRADE__EXCHANGE__KEY')
+secret = os.environ.get('FREQTRADE__EXCHANGE__SECRET')
+
+proxy = os.environ.get('CI_WEB_PROXY')
+
+exchange = ccxt.binance({
+    'apiKey': key,
+    'secret': secret,
+    'httpsProxy': proxy,
+    'options': {'defaultType': 'swap'}
+    })
+_ = exchange.load_markets()
+
+lev_tiers = exchange.fetch_leverage_tiers()
+
+# Assumes this is running in the root of the repository.
+file = Path('freqtrade/exchange/binance_leverage_tiers.json')
+json.dump(dict(sorted(lev_tiers.items())), file.open('w'), indent=2)