flake: delete github actions workflows

.github/workflows/update-inputs.yml

@@ -1,28 +0,0 @@
-name: Update inputs
-
-on:
-  schedule:
-    - cron: "0 0 * * 5"
-  workflow_dispatch:
-
-jobs:
-  update-inputs:
-    runs-on: ubuntu-latest
-    name: Update Inputs
-    steps:
-      - uses: actions/checkout@v3
-        with:
-          token: ${{ github.token }}
-          ref: ${{ github.head_ref }}
-      - uses: cachix/install-nix-action@v20
-        with:
-          github_access_token: ${{ github.token }}
-      - name: Update inputs
-        run: |
-          nix flake update
-      - name: Commit changes
-        uses: EndBug/add-and-commit@v9
-        with:
-          message: 'Actions: Update Inputs'
-          default_author: github_actions
-          add: 'flake.lock'