add option in requirements.txt to differentiate environments to stage otcdocstheme releases

tools/generate_doc_confpy.py

@@ -236,6 +236,8 @@ def process_repositories(args, service):
             if doc["type"] == "dev":
                 doc["type"] = "dev-guide"
             context["docs"].append(doc)
+        
+        context["target_environment"] = args.target_environment
 
         tox_ini_content = tox_ini_template.render(**context)
         tox_ini_path = pathlib.Path(copy_to, "tox.ini")
@@ -313,6 +315,7 @@ def main():
     parser.add_argument(
         "--target-environment",
         required=True,
+        choices=["internal", "public"],
         help="Environment to be used as a source",
     )
     parser.add_argument("--service-type", help="Service to update")