fix: correct the default listen to also use ipv6

Author: rwxd

README.md

@@ -326,7 +326,7 @@ index_html: |
 ```bash
 LOG_LEVEL=DEBUG       # Optional: DEBUG, INFO, WARNING, ERROR (default: DEBUG)
 LOG_FORMAT=json       # Optional: "text" (default) or "json" for structured logging
-LISTEN_HOST=0.0.0.0   # Optional: Host to bind to (default: 0.0.0.0)
+LISTEN_HOST=0.0.0.0   # Optional: Host to bind to (default: *)
 LISTEN_PORT=8000      # Optional: Port to listen on (default: 8000)
 ```
 

powerdns_api_proxy/__main__.py

@@ -5,7 +5,7 @@
 
 
 def main() -> int:
-    host = os.getenv("LISTEN_HOST", "0.0.0.0")
+    host = os.getenv("LISTEN_HOST", "*")
     port = int(os.getenv("LISTEN_PORT", "8000"))
     reload = "--reload" in sys.argv