style: format github actions

.github/workflows/nix.yaml

@@ -1,24 +1,24 @@
-  name: 
+name: Nix CI
 on:
-  pull_request:
-  workflow_dispatch:
-  push:
-    branches:
-      - main
-    tags:
-      - v?[0-9]+.[0-9]+.[0-9]+*
+    pull_request:
+    workflow_dispatch:
+    push:
+        branches:
+            - main
+        tags:
+            - v?[0-9]+.[0-9]+.[0-9]+*
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
-  cancel-in-progress: true
- 
+    group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+    cancel-in-progress: true
+
 jobs:
-  nix-ci:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: DeterminateSystems/nix-installer-action@main
-        with:
-          determinate: true
-      - uses: DeterminateSystems/flake-checker-action@main
-      - run: nix flake check --all-systems
+    nix-ci:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: DeterminateSystems/nix-installer-action@main
+              with:
+                  determinate: true
+            - uses: DeterminateSystems/flake-checker-action@main
+            - run: nix flake check --all-systems