remove broken action

.github/workflows/build.yml

@@ -1,24 +0,0 @@
-name: CI
-
-on:
-  workflow_dispatch: # allows manual triggering
-  schedule:
-    - cron: '5 0 * * 6' # runs weekly on Saturday at 00:05 (give time for flake lock update)
-
-env: 
-  TARGET_FLAKE: github:${{ github.repository }}/${{ inputs.sha || github.sha }}
-
-jobs:
-  check:
-    runs-on: ubuntu-latest
-    permissions:
-      id-token: "write"
-      contents: "read"
-    steps:
-      - uses: actions/checkout@v4
-      - uses: DeterminateSystems/nix-installer-action@main
-      - uses: DeterminateSystems/magic-nix-cache-action@main
-      - uses: DeterminateSystems/flake-checker-action@main
-      - name: Run `nix build`
-        run: GC_DONT_GC=1 nix build --accept-flake-config --show-trace --log-lines
-          10000 --fallback "$TARGET_FLAKE#"'nixosConfigurations.surface.config.boot.kernelPackages.kernel'