chore: fix formatting and add treefmt

.github/workflows/nix-flake-check.yml

@@ -1,26 +1,24 @@
 name: Continuous Integration
-
 on:
   pull_request:
   push:
     branches: [main]
-
 jobs:
   checks:
     name: "Checks"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v26
-      with:
-        nix_path: nixpkgs=channel:nixos-stable
-        extra_nix_config: |
-          experimental-features = nix-command flakes
-          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
-          system-features = nixos-test benchmark big-parallel kvm
-    - uses: cachix/cachix-action@v14
-      with:
-        name: dadada
-        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
-        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-    - run: nix flake check
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v26
+        with:
+          nix_path: nixpkgs=channel:nixos-stable
+          extra_nix_config: |
+            experimental-features = nix-command flakes
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+            system-features = nixos-test benchmark big-parallel kvm
+      - uses: cachix/cachix-action@v14
+        with:
+          name: dadada
+          signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+      - run: nix flake check