Fix release builds

[RemiBardon]

Release builds have been broken for a long time, I should fix it one day…

It's caused by the fact that we use #[cfg(debug_assertions)] for a parameter in the invite_member route, and Rocket's #[post(…)] macro doesn't expect it. I was hoping it would be found and fixed by the Rocket team, but seems like they never noticed it.

One day I should take some time to create a minimal reproducible example for them or just remove #[cfg(debug_assertions)] as a temporary workaround.

   Compiling prose-pod-api v0.2.0 (/project)
error[E0061]: this function takes 7 arguments but 8 arguments were supplied
  --> src/v1/invitations/routes.rs:60:21
   |
60 | pub(super) async fn invite_member<'r>(
   |                     ^^^^^^^^^^^^^
...
68 |     #[cfg(debug_assertions)] invitation_service: LazyGuard<UnauthenticatedInvitationService<'r>>,
   |                              ------------------ unexpected argument of type `LazyGuard<unauthenticated_invitation_service::UnauthenticatedInvitationService<'_>>`
   |
note: function defined here
  --> src/v1/invitations/routes.rs:60:21
   |
60 | pub(super) async fn invite_member<'r>(
   |                     ^^^^^^^^^^^^^
61 |     conn: Connection<'r, Db>,
   |     ------------------------
62 |     app_config: &State<AppConfig>,
   |     -----------------------------
63 |     server_config: LazyGuard<ServerConfig>,
   |     --------------------------------------
64 |     jid: LazyGuard<BareJid>,
   |     -----------------------
65 |     notifier: LazyGuard<Notifier<'r>>,
   |     ---------------------------------
66 |     invitation_controller: LazyGuard<InvitationController<'r>>,
   |     ----------------------------------------------------------
67 |     req: Json<InviteMemberRequest>,
   |     ------------------------------

For more information about this error, try `rustc --explain E0061`.
error: could not compile `prose-pod-api` (lib) due to 1 previous error