remove github workflow

.github/workflows/update.yml

@@ -1,46 +0,0 @@
-name: update
-on:
-  workflow_dispatch: # allows manual triggering
-  schedule:
-    - cron: "49 4 * * *"
-jobs:
-  flake-lock:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v3
-      - name: Install Nix
-        uses: cachix/install-nix-action@v18
-        with:
-          nix_path: nixpkgs=channel:nixos-unstable
-          extra_nix_config: |
-            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
-            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= nixcache:8KKuGz95Pk4UJ5W/Ni+pN+v+LDTkMMFV4yrGmAYgkDg= hydra.nixos.org-1:CNHJZBh9K4tP3EKF6FkkgeVYsS3ohTl+oS0Qa8bezVs= chir-rs:AnwyFacopHSkprD6aXY4/R3J9JYzTbV2rosJCBPaB28=
-            experimental-features = nix-command flakes ca-derivations
-            post-build-hook = ${{ github.workspace }}/scripts/post-build-hook
-            substituters = https://attic.chir.rs/chir-rs/ https://cache.nixos.org/
-      - name: Download attic
-        run: nix build github:DarkKirb/nix-packages#attic-client
-      - name: Set up secrets
-        run: nix run github:DarkKirb/nix-packages#attic-client -- login attic-server https://attic-nocdn.chir.rs/ "$ATTIC_TOKEN"
-        env:
-          ATTIC_TOKEN: ${{secrets.ATTIC_TOKEN}}
-      - name: Update flake.lock
-        run: nix flake update
-      - name: Run update script
-        run: yes '' | nix-shell ./scripts/update.nix --argstr max-workers 1
-      - name: Format
-        run: nix fmt
-      - name: Delete secrets
-        run: |
-          rm ~/cache.key
-      - name: Create PR
-        uses: peter-evans/create-pull-request@v4.2.0
-        with:
-          commit-message: Update nix-packages
-          author: Github Actions <github-actions@users.noreply.github.com>
-          committer: Github Actions <github-actions@users.noreply.github.com>
-          title: Automated updates for nix-packages
-          body: Automated updates
-          assignees: darkkirb
-          reviewers: darkkirb