Use NIX for CI

.envrc

@@ -0,0 +1 @@
+use flake

.github/workflows/pr.yml

@@ -1,4 +1,6 @@
-name: Rust
+name: CI
+permissions:
+  contents: read
 
 on:
   pull_request:
@@ -14,20 +16,13 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@v1
+      # Install Nix
+      - uses: cachix/install-nix-action@v27
         with:
-          toolchain: stable
-          targets: wasm32-unknown-unknown
-          components: clippy, rustfmt
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
 
-      # Install Just to run CI scripts
-      - uses: extractions/setup-just@v3
-
-      # Cargo binstall is used to install tools faster than compiling them from source.
-      - uses: cargo-bins/cargo-binstall@main
-      - run: just setup-tools
+      # Set RUSTFLAGS
+      - run: echo "RUSTFLAGS=--cfg=web_sys_unstable_apis" >> $GITHUB_ENV
 
       # Make sure u guys don't write bad code
-      - run: just check
-      - run: just test
+      - run: nix develop --command just check

.gitignore

@@ -1,2 +1,3 @@
 target
 Cargo.lock
+.direnv/

flake.nix

@@ -0,0 +1,41 @@
+{
+  description = "Web Transport development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      flake-utils,
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+
+        tools = [
+          pkgs.rustc
+          pkgs.cargo
+          pkgs.rustfmt
+          pkgs.clippy
+          pkgs.cargo-shear
+          pkgs.cargo-sort
+          pkgs.cargo-edit
+          pkgs.cargo-hack
+          pkgs.just
+          pkgs.pkg-config
+          pkgs.glib
+          pkgs.gtk3
+        ];
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          packages = tools;
+        };
+      }
+    );
+}