ci: simplify CI (#61)

* ci: simplify CI

* ci: need moar disk space

* ci: fix nix install errors

* ci: another try at /nix permissions

.github/workflows/Nix.yml

@@ -18,47 +18,70 @@ jobs:
         with:
           fail-mode: true
 
-  nixos-test:
-    name: "NixOS Nix Test"
-    runs-on: ubuntu-latest
+  config-tests:
+    name: "${{ matrix.os-name }} Nix Test"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            os-name: "Linux x86"
+            flake-attr: nixosConfigurations.framework.config.system.build.toplevel
+          - os: macos-latest
+            os-name: "macOS x86"
+            flake-attr: darwinConfigurations.macbook_x86.config.system.build.toplevel
+          - os: macos-14
+            os-name: "macOS Apple Silicon"
+            flake-attr: darwinConfigurations.macbook.config.system.build.toplevel
     steps:
-      - uses: actions/checkout@v4
+      - name: "Checkout Repo"
+        uses: actions/checkout@v4
 
-      - name: "Install Nix ❄️"
-        uses: DeterminateSystems/nix-installer-action@v10
-
-      - name: "Nix Cache"
-        uses: DeterminateSystems/magic-nix-cache-action@v4
-
-      - name: "Build NixOS config ❄️"
-        run: nix build --dry-run -L '.#nixosConfigurations.framework.config.system.build.toplevel' --show-trace
-
-  macos-x86-test:
-    name: "macOS Intel Nix Test"
-    runs-on: macos-latest
-    steps:
-      - uses: actions/checkout@v4
+      - name: Free Disk Space (Ubuntu)
+        if: matrix.os == 'ubuntu-latest'
+        uses: jlumbroso/free-disk-space@main
+        with:
+          # this might remove tools that are actually needed,
+          # when set to "true" but frees about 6 GB
+          tool-cache: true
 
-      - name: "Install Nix ❄️"
-        uses: DeterminateSystems/nix-installer-action@v10
+          # all of these default to true, but feel free to set to
+          # "false" if necessary for your workflow
+          android: true
+          dotnet: true
+          haskell: true
+          large-packages: true
+          swap-storage: true
 
-      - name: "Nix Cache"
-        uses: DeterminateSystems/magic-nix-cache-action@v4
+      - name: "Create dir for mounting moar disk Space"
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          sudo mkdir /nix
 
-      - name: "Build NixOS config ❄️"
-        run: nix run nix-darwin -- check --flake .#macbook_x86
+      - name: "Maximize Disk Space"
+        if: matrix.os == 'ubuntu-latest'
+        uses: easimon/maximize-build-space@v8
+        with:
+          build-mount-path: /nix
+          remove-dotnet: "true"
+          remove-android: "true"
+          remove-haskell: "true"
+          temp-reserve-mb: "100"
+          swap-size-mb: "4096"
+          root-reserve-mb: "1024"
 
-  macos-arm-test:
-    name: "macOS Apple Silicon Nix Test"
-    runs-on: macos-14
-    steps:
-      - uses: actions/checkout@v4
+      - name: "Adjust permissions for /nix"
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          sudo chown -R root:root /nix
+          sudo chmod -R 755 /nix
 
-      - name: "Install Nix ❄️"
+      - name: "Install Nix"
         uses: DeterminateSystems/nix-installer-action@v10
 
       - name: "Nix Cache"
         uses: DeterminateSystems/magic-nix-cache-action@v4
 
-      - name: "Build NixOS config ❄️"
-        run: nix run nix-darwin -- check --flake .#macbook
+      - name: "Test Nix config"
+        run: nix build -L '.#${{ matrix.flake-attr }}'
+