🔧(backend) fix configuration to avoid different ssl warning

Fix following warning messages :
- You have not set a value for the SECURE_HSTS_SECONDS setting.
- Your SECURE_SSL_REDIRECT setting is not set to True.

src/backend/impress/settings.py

@@ -546,6 +546,14 @@ class Production(Base):
     # In other cases, you should comment the following line to avoid security issues.
     # SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTO", "https")
     SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTO", "https")
+    SECURE_HSTS_SECONDS = 60
+    SECURE_HSTS_PRELOAD = True
+    SECURE_HSTS_INCLUDE_SUBDOMAINS = True
+    SECURE_SSL_REDIRECT = True
+    SECURE_REDIRECT_EXEMPT = [
+        "^__lbheartbeat__",
+        "^__heartbeat__",
+    ]
 
     # Modern browsers require to have the `secure` attribute on cookies with `Samesite=none`
     CSRF_COOKIE_SECURE = True