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diff --git a/.github/workflows/checkandformat.yml b/.github/workflows/checkandformat.yml
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+name: check and format flake
+
+on:
+  pull_request:
+  push:
+  workflow_dispatch:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: cachix/install-nix-action@v19
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - run: nix flake check
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        if: ${{ github.event_name == 'pull_request' }}
+        with:
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+          ref: ${{ github.event.pull_request.head.ref }}
+
+      - uses: cachix/install-nix-action@v19
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - run: nix fmt
+
+      - uses: EndBug/add-and-commit@v9
+        with:
+          default_autor: github_actions
+          message: "chore: format flake"