build non-critical infrastructure in CI

Author: Mic92

.github/workflows/ci.yml

@@ -11,9 +11,11 @@ permissions:
   contents: read
 
 jobs:
-  nix-fmt:
+  # We probably should replace with a different faster CI soon,
+  # but atleast this gives us confidence for now
+  nix-build:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@v27
-    - run: nix fmt -- --fail-on-change
+    - run: nix run github:Mic92/nix-fast-build -- --no-nom

checks/flake-module.nix

@@ -0,0 +1,17 @@
+{ ... }:
+{
+  perSystem =
+    { self', lib, ... }:
+    {
+      checks =
+        let
+          nixosMachines = lib.mapAttrs' (
+            name: config: lib.nameValuePair "nixos-${name}" config.config.system.build.toplevel
+          ) ((lib.filterAttrs (_: config: config.pkgs.system == system)) self.nixosConfigurations);
+
+          packages = lib.mapAttrs' (n: lib.nameValuePair "package-${n}") self'.packages;
+          devShells = lib.mapAttrs' (n: lib.nameValuePair "devShell-${n}") self'.devShells;
+        in
+        nixosMachines // packages // devShells;
+    };
+}

flake.nix

@@ -51,6 +51,7 @@
       ];
       imports = [
         ./formatter/flake-module.nix
+        ./checks/flake-module.nix
         ./terraform/flake-module.nix
         ./non-critical-infra/flake-module.nix
       ];