Remove check step

... it has served its purpose (development) and is using runner time

.github/workflows/nix.yml

@@ -21,74 +21,6 @@ on:
       - '*.ini'
 
 jobs:
-  check:
-    runs-on: ubuntu-22.04
-    outputs:
-      NIXPKGS: ${{ steps.prep.outputs.NIXPKGS }}
-      NIX_PATH: ${{ steps.prep.outputs.NIX_PATH }}
-    env:
-      nixpkgs: nixos-24_11
-    steps:
-      - name: Checkout
-        id: checkout
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-          fetch-tags: true
-
-      - name: Install nix
-        id: install_nix
-        uses: nixbuild/nix-quick-install-action@v28
-
-      - name: Show the flake
-        id: show
-        run: |
-          nix flake show
-
-      - name: Check the flake
-        id: check
-        env:
-          # FIXME: Our python39 package depends on some broken zope
-          NIXPKGS_ALLOW_BROKEN: 1
-        run: |
-          echo FIXME: nix flake check --impure
-
-      - name: Restore and cache Nix store for nixpkgs-${{ env.nixpkgs }}
-        uses: nix-community/cache-nix-action@v5
-        with:
-          # restore and save a cache using this key
-          primary-key: nixpkgs-${{ env.nixpkgs }}-${{ hashFiles('flake.*', '*.nix') }}
-          # if there's no cache hit, restore a cache by this prefix
-          restore-prefixes-first-match: nixpkgs-${{ env.nixpkgs }}-
-          # collect garbage until Nix store size (in bytes) is at most this number
-          # before trying to save a new cache
-          gc-max-store-size-linux: 1073741824
-          # do purge caches
-          purge: true
-          # purge all versions of the cache
-          purge-prefixes: nixpkgs-${{ env.nixpkgs }}-
-          # created more than 0 seconds ago relative to the start of the `Post Restore` phase
-          purge-created: 0
-          # except the version with the `primary-key`, if it exists
-          purge-primary-key: never
-
-      - name: Prepare environment
-        id: prep
-        run: |
-          # Get the reference to the nixpkgs pinned in the flake - dirty way
-          NIXPKGS=$(nix flake metadata | grep -E '[^\w]+nixpkgs-${{ matrix.nixpkgs }}[^\w]+:' | cut -d' ' -f2 | cut -d'?' -f1)
-          NIX_PATH=nixpkgs=https://github.com/NixOS/nixpkgs/archive/${NIXPKGS##*/}.tar.gz
-          # Pass those variables to the next steps and jobs
-          echo NIXPKGS=$NIXPKGS | tee -a $GITHUB_ENV >> $GITHUB_OUTPUT
-          echo NIX_PATH=$NIX_PATH | tee -a $GITHUB_ENV >> $GITHUB_OUTPUT
-
-      - name: Generate version
-        # The Nix package doesn't know how to do this part, unfortunately.
-        run: |
-          nix-shell \
-            -p 'python3.withPackages (ps: [ ps.setuptools ])' \
-            --run 'python setup.py update_version'
-
   packaging:
     runs-on: ubuntu-22.04
     needs: check