[chore] ci: removed scheduled actions

.github/workflows/check.yml

@@ -6,9 +6,6 @@ on:
       - ./**.nix
       - ./flake.lock
   pull_request:
-  # scheduled runs are run on my own infrastructure
-  # schedule:
-  #   - cron: 5 4 * * 5 # At 04:05 on Friday.
 
 jobs:
   check:
@@ -23,21 +20,8 @@ jobs:
         run: |
           nix flake check --verbose --keep-going
           nix run nixpkgs#statix -- check .
-  lockfile:
-    runs-on: ubuntu-latest
-    needs: check
-    if: ${{ github.event_name == 'schedule' }} # only run when scheduled
-    steps:
-      - uses: actions/checkout@v4
-      - uses:  DeterminateSystems/nix-installer-action@v13
-        with:
-          source-url: "https://install.lix.systems/lix/lix-installer-x86_64-linux"
-      - uses: DeterminateSystems/update-flake-lock@v23
-      - name: Run `nix flake check`
-        run: nix flake check --verbose --keep-going
   build-docs:
     runs-on: ubuntu-latest
-    if: ${{ github.event_name != 'schedule' }} # only run when not scheduled
     steps:
       - uses: actions/checkout@v4
       - uses: DeterminateSystems/magic-nix-cache-action@v7