CI: add test action

.github/workflows/test.yml

@@ -0,0 +1,39 @@
+name: Test
+
+on: [push, pull_request, workflow_dispatch]
+jobs:
+  nix:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: DeterminateSystems/nix-installer-action@main
+    - uses: DeterminateSystems/magic-nix-cache-action@main
+
+    # not needed (yet)
+    # - uses: cachix/cachix-action@v12
+    #   with:
+    #     name: hyprland
+    #     authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+
+    - name: Build
+      run: nix build .#hyprcursor-with-tests --print-build-logs --keep-going
+
+      # keep a fixed rev in case anything changes
+    - name: Install hyprcursor theme
+      run: nix build github:fufexan/dotfiles/4e05e373c1c70a2ae259b2c15eec2ad6e11ce581#bibata-hyprcursor --print-build-logs --keep-going
+
+    - name: Set up env
+      run: |
+        export HYPRCURSOR_THEME=Bibata-Modern-Classic-Hyprcursor
+        export HYPRCURSOR_SIZE=16
+        mkdir -p $HOME/.local/share/icons
+        ln -s $(realpath result/share/icons/Bibata-Modern-Classic-Hyprcursor) $HOME/.local/share/icons/
+
+    - name: Run test1
+      run: nix shell .#hyprcursor-with-tests -c hyprcursor_test1
+    - name: Run test2
+      run: nix shell .#hyprcursor-with-tests -c hyprcursor_test2
+    - name: Run test_c
+      run: nix shell .#hyprcursor-with-tests -c hyprcursor_test_c
+