Action for checking if the flakes are correct

.github/workflows/check.yml

@@ -0,0 +1,28 @@
+name: Validate Nix Flake
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+    - '**.nix'
+    - '**.lock'
+    - '.github/workflows/check.yml'
+
+jobs:
+  check-flake:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+        fetch-depth: 1
+
+    - name: Install Nix
+      uses: DeterminateSystems/nix-installer-action@main
+      with:
+        logger: pretty
+
+    - name: Check Flake
+      run: nix flake check --accept-flake-config