ADD: allow use opf NETDB_SCHEME envvar

setup.py

@@ -6,7 +6,7 @@ import requests
 import semver
 
         
-vers = requests.get(f"https://{os.environ.get('NETDB_ENDPOINT')}").json()[0]
+vers = requests.get(f"{os.environ.get('NETDB_SCHEME', 'https')}://{os.environ.get('NETDB_ENDPOINT')}").json()[0]
 largest_ver = None
 for v in vers:
     sem_v = semver.Version.parse(v['numeric'])