remove outdated check workflow

.github/workflows/checks.yml

@@ -1,40 +0,0 @@
-name: Run Nix Flake Checks
-
-on:
-  workflow_call:
-  workflow_dispatch:
-    inputs:
-      lockFile:
-        description: "flake.lock file"
-        type: string
-
-jobs:
-  checks:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: ./.github/actions/clean-disk
-        with:
-          purge-packages: false
-
-      - uses: DeterminateSystems/nix-installer-action@main
-        with:
-          extra-conf: |
-            accept-flake-config = true
-      - uses: DeterminateSystems/magic-nix-cache-action@v8
-      - uses: cachix/cachix-action@v15
-        with:
-          name: daylin
-          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
-
-      - name: write lock file
-        if: "${{ inputs.lockFile != '' }}"
-        run: |
-          echo '${{ inputs.lockFile }}' > flake.lock
-          git diff
-
-      - name: Build
-        run: |
-          set -euo pipefail
-          cachix watch-exec daylin -- nix build '.#checks.x86_64-linux.makePackages'