api: use API_HOST env variable everywhere (#21814)

* api base url to global constant

* update api/__init__.py
old-commit-hash: 543e019f715a7e485c7402d1e145dc8e81d43611

common/api/__init__.py

@@ -1,9 +1,12 @@
 import jwt
+import os
 import requests
 from datetime import datetime, timedelta
 from common.basedir import PERSIST
 from selfdrive.version import version
 
+API_HOST = os.getenv('API_HOST', 'https://api.commadotai.com')
+
 class Api():
   def __init__(self, dongle_id):
     self.dongle_id = dongle_id
@@ -34,12 +37,10 @@ class Api():
     
 
 def api_get(endpoint, method='GET', timeout=None, access_token=None, **params):
-  backend = "https://api.commadotai.com/"
-
   headers = {}
   if access_token is not None:
     headers['Authorization'] = "JWT "+access_token
 
   headers['User-Agent'] = "openpilot-" + version
 
-  return requests.request(method, backend+endpoint, timeout=timeout, headers=headers, params=params)
+  return requests.request(method, API_HOST+endpoint, timeout=timeout, headers=headers, params=params)