fix: verify edge-owned HSTS during deployment

backend/config/settings.py

@@ -189,6 +189,12 @@ SECURE_HSTS_SECONDS = int(
 )
 SECURE_HSTS_INCLUDE_SUBDOMAINS = USE_HTTPS
 SECURE_HSTS_PRELOAD = USE_HTTPS
+HSTS_AT_EDGE = os.getenv("DJANGO_HSTS_AT_EDGE", "false").lower() == "true"
+SILENCED_SYSTEM_CHECKS = (
+    ["security.W004"]
+    if USE_HTTPS and HSTS_AT_EDGE and SECURE_HSTS_SECONDS == 0
+    else []
+)
 
 LOGGING = {
     "version": 1,