Add CI target for .#nixin

.github/workflows/build.yml

@@ -0,0 +1,34 @@
+name: "build"
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  nix-setup:
+    uses: ./.github/workflows/nix-setup.yml
+
+  clawsiecats-minimal:
+    runs-on: ubuntu-latest
+    needs: nix-setup
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Nix
+        uses: cachix/install-nix-action@v26
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - name: clawsiecats-minimal
+        run: |
+          nix build .#nixosConfigurations.clawsiecats-minimal.config.system.build.toplevel
+
+  nixin:
+    runs-on: ubuntu-latest
+    needs: nix-setup
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Nix
+        uses: cachix/install-nix-action@v26
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - name: nixin
+        run: |
+          nix build .#nixosConfigurations.nixin.config.system.build.toplevel

.github/workflows/setup-nix.yml

@@ -0,0 +1,24 @@
+name: Nix Setup
+
+on:
+  workflow_call: {}
+
+jobs:
+  setup:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Maximize build space
+        uses: AdityaGarg8/remove-unwanted-software@v2
+        with:
+          remove-dotnet: 'true'
+          remove-android: 'true'
+          remove-haskell: 'true'
+          remove-codeql: 'true'
+          remove-docker-images: 'true'
+      - uses: pierotofy/set-swap-space@master
+        with:
+          swap-size-gb: 10
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v26
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable