add script that runs gunicorn production server

src/mtl/run_gunicorn.py

@@ -0,0 +1,24 @@
+from gunicorn.app.base import BaseApplication
+
+class StandaloneApplication(BaseApplication):
+    def __init__(self, app, options=None):
+        self.options = options or {}
+        self.application = app
+        super().__init__()
+
+    def load_config(self):
+        for key, value in self.options.items():
+            self.cfg.set(key.lower(), value)
+
+    def load(self):
+        return self.application
+
+def run_gunicorn():
+    from .run_server import app
+
+    options = {
+        "bind": "127.0.0.1:15478",
+        "workers": 12,
+    }
+
+    StandaloneApplication(app, options).run()