ci: use nightly rustfmt

we were using this before, but it broke when refactoring the flake out into separate files

nix/shell.nix

@@ -23,7 +23,7 @@ mkShell {
   };
 
   # Development tools
-  nativeBuildInputs = default.nativeBuildInputs ++ [
+  nativeBuildInputs = [
     # Always use nightly rustfmt because most of its options are unstable
     #
     # This needs to come before `toolchain` in this list, otherwise
@@ -57,5 +57,5 @@ mkShell {
 
     # Useful for editing the book locally
     mdbook
-  ];
+  ] ++ default.nativeBuildInputs ;
 }

src/api/ruma_wrapper/axum.rs

@@ -7,8 +7,11 @@ use axum::{
     response::{IntoResponse, Response},
     RequestExt, RequestPartsExt,
 };
-use axum_extra::headers::authorization::Bearer;
-use axum_extra::{headers::Authorization, typed_header::TypedHeaderRejectionReason, TypedHeader};
+use axum_extra::{
+    headers::{authorization::Bearer, Authorization},
+    typed_header::TypedHeaderRejectionReason,
+    TypedHeader,
+};
 use bytes::{BufMut, BytesMut};
 use http::{Request, StatusCode};
 use ruma::{

src/service/globals/mod.rs

@@ -1,9 +1,9 @@
 mod data;
-pub use data::Data;
-pub use data::SigningKeys;
-use ruma::MilliSecondsSinceUnixEpoch;
-use ruma::{serde::Base64, OwnedDeviceId, OwnedEventId, OwnedRoomId, OwnedServerName, OwnedUserId};
-use ruma::{OwnedRoomAliasId, RoomAliasId};
+pub use data::{Data, SigningKeys};
+use ruma::{
+    serde::Base64, MilliSecondsSinceUnixEpoch, OwnedDeviceId, OwnedEventId, OwnedRoomAliasId,
+    OwnedRoomId, OwnedServerName, OwnedUserId, RoomAliasId,
+};
 
 use crate::api::server_server::FedDest;
 
@@ -16,7 +16,6 @@ use ruma::{
     api::{client::sync::sync_events, federation::discovery::ServerSigningKeys},
     DeviceId, RoomVersionId, ServerName, UserId,
 };
-use std::str::FromStr;
 use std::{
     collections::{BTreeMap, HashMap},
     error::Error as StdError,
@@ -25,6 +24,7 @@ use std::{
     iter,
     net::{IpAddr, SocketAddr},
     path::PathBuf,
+    str::FromStr,
     sync::{
         atomic::{self, AtomicBool},
         Arc, RwLock as StdRwLock,