workaround space usage in CI

Author: Mic92

.github/workflows/ci.yml

@@ -19,3 +19,16 @@ jobs:
     - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@v27
     - run: nix run github:Mic92/nix-fast-build -- --no-nom
+  # all builds combined consume too much disk space... we should soon switch to something else
+  nixos:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # we actually cannot build umbriel just now
+        # but it also looks like it doesn't run important stuff
+        #machine: [caliban, umbriel]
+        machine: [caliban]
+    steps:
+    - uses: actions/checkout@v4
+    - uses: cachix/install-nix-action@v27
+    - run: nix build '.#nixosConfigurations."${{ matrix.machine }}.nixos.org".config.system.build.toplevel'

checks/flake-module.nix

@@ -5,9 +5,11 @@
     {
       checks =
         let
-          nixosMachines = lib.mapAttrs' (
-            name: config: lib.nameValuePair "nixos-${name}" config.config.system.build.toplevel
-          ) ((lib.filterAttrs (_: config: config.pkgs.system == system)) self.nixosConfigurations);
+          # TODO: our CI doesn't have a enough space for these just now
+          #nixosMachines = lib.mapAttrs' (
+          #  name: config: lib.nameValuePair "nixos-${name}" config.config.system.build.toplevel
+          #) ((lib.filterAttrs (_: config: config.pkgs.system == system)) self.nixosConfigurations);
+          nixosMachines = { };
 
           packages = lib.mapAttrs' (n: lib.nameValuePair "package-${n}") self'.packages;
           devShells = lib.mapAttrs' (n: lib.nameValuePair "devShell-${n}") self'.devShells;