Improve and condense related controls

app/local_settings.py

@@ -48,7 +48,13 @@ if DEBUG:
 SETTINGS_EXPORT = ["BILLING_ENABLED"]
 
 SIGNAL_NUMBER = getenv("SIGNAL_NUMBER")
-SIGNAL_HTTP_URL = getenv("SIGNAL_HTTP_URL", "http://signal:8080")
+_container_runtime = getenv("container", "").strip().lower()
+_signal_default_url = (
+    "http://127.0.0.1:8080"
+    if _container_runtime == "podman"
+    else "http://signal:8080"
+)
+SIGNAL_HTTP_URL = getenv("SIGNAL_HTTP_URL", _signal_default_url)
 
 WHATSAPP_ENABLED = getenv("WHATSAPP_ENABLED", "false").lower() in trues
 WHATSAPP_HTTP_URL = getenv("WHATSAPP_HTTP_URL", "http://whatsapp:8080")