added twilio healthcheck command

src/api/management/commands/twilio_healthcheck.py

@@ -0,0 +1,17 @@
+import typing as t
+from argparse import ArgumentParser
+
+from django.core.management.base import BaseCommand
+
+from api import settings
+from api.messages import send_whatsapp_message
+
+
+class Command(BaseCommand):
+    help = "Twilio healthcheck command."
+
+    def add_arguments(self, parser: ArgumentParser) -> None:
+        pass
+
+    def handle(self, *args: t.Any, **options: t.Any) -> None:
+        send_whatsapp_message(settings.MY_PHONE_NUMBER, "healthcheck")