fix flake check errors + add gha

.github/workflows/nixos.yml

@@ -37,3 +37,21 @@ jobs:
       - name: "Build NixOS config ❄️"
         run: |
           nix run '.#' build
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2.3.2
+
+      - 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 flake check
+

flake.nix

@@ -64,7 +64,7 @@
     in
     {
       # Make the nixosConfigurations, mostly for vault-secrets
-      nixosConfigurations = util.mkNixosConfigurations specialArgs hosts;
+      nixosConfigurations = util.mkNixosConfigurations specialArgs nixHosts;
 
       # Make the coleman configuration
       colmena = lib.foldr (el: acc: acc // util.mkColmenaHost el)

util.nix

@@ -28,13 +28,25 @@ rec {
   mkNixosSystem = specialArgs: { hostname, realm, system ? "x86_64-linux", ... }@host: {
     "${hostname}.${realm}" = lib.nixosSystem {
       inherit system specialArgs;
-      modules = resolve_imports host;
+      modules =
+        [
+          ({ config, pkgs, ... }: {
+            nixpkgs.overlays = [ (import ./nixos/pkgs) ];
+            networking = {
+              hostName = hostname;
+              domain = realm;
+            };
+          })
+        ] ++
+        (resolve_imports host);
     };
   };
 
-  mkColmenaHost = { ip ? null, hostname, tags, realm, type ? "lxc", ... }@host: let 
+  mkColmenaHost = { ip ? null, hostname, tags, realm, type ? "lxc", ... }@host:
+    let
       name = if realm == "thalassa" then hostname else "${hostname}.${realm}";
-  in{
+    in
+    {
       "${name}" = {
         imports = resolve_imports host;
         networking = {