Add CI step for leverage tier updates

.github/workflows/binance-lev-tier_update.yml

@@ -0,0 +1,47 @@
+name: Binance Leverage tiers update
+
+on:
+  # schedule:
+  #   - cron: "0 3 * * 2"
+  # on demand
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  auto-update:
+    runs-on: ubuntu-latest
+    environment:
+      name: develop
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: actions/setup-python@v5
+      with:
+        python-version: "3.11"
+
+    - name: Install ccxt
+      run: pip install ccxt
+
+    - name: Run leverage tier update
+      env:
+        CI_WEB_PROXY: secrets.CI_WEB_PROXY
+        FREQTRADE__EXCHANGE__KEY: secrets.BINANCE_EXCHANGE_KEY
+        FREQTRADE__EXCHANGE__SECRET: secrets.BINANCE_EXCHANGE_SECRET
+      run: python build_helpers/binance_update_lev_tiers.py
+
+
+    - uses: peter-evans/create-pull-request@v6
+      with:
+        token: ${{ secrets.REPO_SCOPED_TOKEN }}
+        add-paths: freqtrade/exchange/binance_leverage_tiers.json
+        labels: |
+          Tech maintenance
+          Dependencies
+        branch: update/pre-commit-hooks
+        title: Update Binance Leverage Tiers
+        commit-message: "chore: update pre-commit hooks"
+        committer: Freqtrade Bot <noreply@github.com>
+        body: Update binance leverage tiers.
+        delete-branch: true

build_helpers/binance_update_lev_tiers.py

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+#!/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)