chore(web02/cas-eleves): Factorize source and use host in ALLOWED_HOSTS

machines/nixos/web02/cas-eleves/default.nix

@@ -14,6 +14,9 @@ let
   inherit (lib) mapAttrsToList;
 
   host = "cas.eleves.ens.fr";
+
+  src = sources.cas-eleves;
+
   port = 9889;
 
   python3 =
@@ -49,7 +52,7 @@ let
   staticDrv = pkgs.stdenv.mkDerivation {
     name = "cas_eleves-static";
 
-    src = sources.cas-eleves;
+    inherit src;
 
     nativeBuildInputs = [ pythonEnv ];
 
@@ -85,13 +88,12 @@ in
         };
         StateDirectory = "django-cas-eleves";
         User = "cas_server";
-        WorkingDirectory = sources.cas-eleves;
+        WorkingDirectory = src;
       };
 
       environment = {
         CE_ALLOWED_HOSTS = builtins.toJSON [
-          "cas-eleves.dgnum.eu"
+          host
-          "cas.eleves.ens.fr"
         ];
         CE_STATIC_ROOT = staticDrv;
       };
@@ -118,7 +120,7 @@ in
         };
         StateDirectory = "django-cas-eleves";
         User = "cas_server";
-        WorkingDirectory = sources.cas-eleves;
+        WorkingDirectory = src;
       };
 
       path = [ pythonEnv ];