various updates

.github/workflows/nixos.yml

@@ -27,38 +27,6 @@ jobs:
           name: nixos-iso
           retention-days: 3
           path: result/iso/*.iso
-  build-null:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2.3.2
-
-      - name: Free Disk Space (Ubuntu)
-        uses: jlumbroso/free-disk-space@main
-        with:
-          # this might remove tools that are actually needed,
-          # if set to "true" but frees about 6 GB
-          tool-cache: true
-          
-          # all of these default to true, but feel free to set to
-          # "false" if necessary for your workflow
-          android: true
-          dotnet: true
-          haskell: true
-          large-packages: true
-          swap-storage: true
-
-      - name: "Install Nix ❄️"
-        uses: cachix/install-nix-action@v15
-
-      - name: "Install Cachix ❄️"
-        uses: cachix/cachix-action@v10
-        with:
-          name: 0x76-infra
-          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
-
-      - name: "Build NixOS config ❄️"
-        run: |
-          nix run '.#' build -- --on "null"
   build-olympus:
     runs-on: ubuntu-latest
     steps: