run.py: accept --host and --port arguments

run.py

@@ -1,8 +1,15 @@
 #!/usr/bin/env python3
 """Development server entry point."""
 
+import argparse
+
 from app import create_app
 
 if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="FlaskPaste dev server")
+    parser.add_argument("--host", default="0.0.0.0", help="Host to bind to")  # noqa: S104
+    parser.add_argument("--port", type=int, default=5000, help="Port to bind to")
+    args = parser.parse_args()
+
     app = create_app("development")
-    app.run(host="0.0.0.0", port=5000)
+    app.run(host=args.host, port=args.port)