Set gradio api server from env (#6666)

* Use GRADIO_API_SERVER env

* Format the code

* add changeset

* Use env GRADIO_SHARE_SERVER_ADDRESS as default share_server_address

---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Abubakar Abid <abubakar@huggingface.co>

.changeset/odd-garlics-teach.md

@@ -0,0 +1,5 @@
+---
+"gradio": minor
+---
+
+feat:Set gradio api server from env

gradio/networking.py

@@ -30,6 +30,7 @@
 TRY_NUM_PORTS = int(os.getenv("GRADIO_NUM_PORTS", "100"))
 LOCALHOST_NAME = os.getenv("GRADIO_SERVER_NAME", "127.0.0.1")
 GRADIO_API_SERVER = "https://api.gradio.app/v2/tunnel-request"
+GRADIO_SHARE_SERVER_ADDRESS = os.getenv("GRADIO_SHARE_SERVER_ADDRESS")
 
 should_watch = bool(os.getenv("GRADIO_WATCH_DIRS", False))
 GRADIO_WATCH_DIRS = (
@@ -218,6 +219,11 @@ def start_server(
 def setup_tunnel(
     local_host: str, local_port: int, share_token: str, share_server_address: str | None
 ) -> str:
+    share_server_address = (
+        GRADIO_SHARE_SERVER_ADDRESS
+        if share_server_address is None
+        else share_server_address
+    )
     if share_server_address is None:
         try:
             response = httpx.get(GRADIO_API_SERVER, timeout=30)