chore: format nix using alejandra

nix/shell.nix

@@ -1,61 +1,69 @@
 # Keep sorted
-{ cargo-deb
-, default
-, engage
-, go
-, inputs
-, jq
-, lychee
-, mdbook
-, mkShell
-, olm
-, system
-, taplo
-, toolchain
+{
+  alejandra,
+  cargo-deb,
+  default,
+  engage,
+  go,
+  inputs,
+  jq,
+  lychee,
+  mdbook,
+  mkShell,
+  olm,
+  system,
+  taplo,
+  toolchain,
 }:
-
 mkShell {
-  env = default.env // {
-    # Rust Analyzer needs to be able to find the path to default crate
-    # sources, and it can read this environment variable to do so. The
-    # `rust-src` component is required in order for this to work.
-    RUST_SRC_PATH = "${toolchain}/lib/rustlib/src/rust/library";
-  };
+  env =
+    default.env
+    // {
+      # Rust Analyzer needs to be able to find the path to default crate
+      # sources, and it can read this environment variable to do so. The
+      # `rust-src` component is required in order for this to work.
+      RUST_SRC_PATH = "${toolchain}/lib/rustlib/src/rust/library";
+    };
 
   # Development tools
-  nativeBuildInputs = default.nativeBuildInputs ++ [
-    # Always use nightly rustfmt because most of its options are unstable
-    #
-    # This needs to come before `toolchain` in this list, otherwise
-    # `$PATH` will have stable rustfmt instead.
-    inputs.fenix.packages.${system}.latest.rustfmt
+  nativeBuildInputs =
+    default.nativeBuildInputs
+    ++ [
+      # Always use nightly rustfmt because most of its options are unstable
+      #
+      # This needs to come before `toolchain` in this list, otherwise
+      # `$PATH` will have stable rustfmt instead.
+      inputs.fenix.packages.${system}.latest.rustfmt
 
-    # rust itself
-    toolchain
+      # rust itself
+      toolchain
 
-    # CI tests
-    engage
+      # CI tests
+      engage
 
-    # format toml files
-    taplo
+      # format toml files
+      taplo
 
-    # Needed for producing Debian packages
-    cargo-deb
+      # Needed for producing Debian packages
+      cargo-deb
 
-    # Needed for our script for Complement
-    jq
+      # Needed for our script for Complement
+      jq
 
-    # Needed for Complement
-    go
-    olm
+      # Needed for Complement
+      go
+      olm
 
-    # Needed for our script for Complement
-    jq
+      # Needed for our script for Complement
+      jq
 
-    # Needed for finding broken markdown links
-    lychee
+      # Needed for finding broken markdown links
+      lychee
 
-    # Useful for editing the book locally
-    mdbook
-  ];
+      # Useful for editing the book locally
+      mdbook
+
+      # nix formatter
+      alejandra
+    ];
 }