try namespace labs

.github/workflows/nix-github-actions.yml

@@ -0,0 +1,39 @@
+name: Nix Flake actions
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - main
+
+jobs:
+  nix-matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v27
+      - id: set-matrix
+        name: Generate Nix Matrix
+        run: |
+          set -Eeu
+          matrix="$(nix eval --json '.#githubActions.matrix')"
+          echo "matrix=$matrix" >> "$GITHUB_OUTPUT"
+
+  nix-build:
+    needs: nix-matrix
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix: ${{fromJSON(needs.nix-matrix.outputs.matrix)}}
+    steps:
+      - uses: actions/checkout@v4
+      - run: |
+          sudo mkdir /nix
+          sudo chown "$USER" /nix
+      - uses: namespacelabs/nscloud-cache-action@v1
+        with:
+          path: /nix
+      - uses: cachix/install-nix-action@v27
+      - run: nix build -L '.#${{ matrix.attr }}'

flake.nix

@@ -1,13 +1,34 @@
 {
   description = "NixOS Village AWS cloud";
-  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-24.05";
-  inputs.nixpkgs-amazon-ssm-agent.url = "github:r-ryantm/nixpkgs?ref=auto-update/amazon-ssm-agent";
-  inputs.pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-24.05";
+    pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
+    nix-github-actions = {
+      url = "github:nix-community/nix-github-actions";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
 
-  outputs = inputs@{ self, nixpkgs, pre-commit-hooks, ... }: {
+  outputs = inputs@{ self, nixpkgs, pre-commit-hooks, nix-github-actions, ... }: {
     lib.supportedSystems = [ "aarch64-darwin" "aarch64-linux" "x86_64-linux" ];
     lib.forAllSystems = nixpkgs.lib.genAttrs self.lib.supportedSystems;
 
+    githubActions = nix-github-actions.lib.mkGithubMatrix {
+      inherit (self) checks;
+      platforms = {
+        x86_64-linux = [
+            "nscloud-ubuntu-22.04-amd64-4x16-with-cache"
+            "nscloud-cache-size-20gb"
+            "nscloud-cache-tag-aarch64-linux"
+        ];
+        aarch64-linux = [
+            "nscloud-ubuntu-22.04-arm64-4x16-with-cache"
+            "nscloud-cache-size-20gb"
+            "nscloud-cache-tag-x86_64-linux"
+        ];
+      };
+    };
+
     devShells = self.lib.forAllSystems (system: {
       default = with nixpkgs.legacyPackages.${system}; mkShell {
         packages = [