added some ci

Author: binarylinuxx

.github/workflows/cachix.yml

@@ -0,0 +1,28 @@
+name: Build and cache
+
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        package:
+          - halley-stable
+          - halley-unstable
+          - halley-unstable-dev
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v31
+      - uses: cachix/cachix-action@v16
+        if: github.event_name == 'push'
+        with:
+          name: halley-flake
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - run: nix build --print-build-logs .#${{ matrix.package }}

README.md

@@ -10,6 +10,16 @@ Nix flake for [Halley](https://github.com/saltnpepper97/halley) — spatial Wayl
 }
 ```
 
+### Cachix
+
+Prebuilt Linux packages are published to the public `halley-flake` Cachix cache. Configure it once before installing or building:
+
+```bash
+nix run nixpkgs#cachix -- use halley-flake
+```
+
+GitHub Actions builds all package variants for each pull request and push. Push builds are uploaded to Cachix. To enable publishing, create a `CACHIX_AUTH_TOKEN` repository secret containing a Cachix auth token with write access to `halley-flake`.
+
 ```bash
 nix build .#halley-stable      # v0.4.0 release
 nix build .#halley-unstable    # latest main branch
@@ -20,7 +30,7 @@ nix build .#default            # same as unstable
 
 | Package | Source | Extras |
 |---|---|---|
-| `halley-stable` | v0.4.0 tag | halley, halleyctl |
+| `halley-stable` | v0.5.0 tag | halley, halleyctl |
 | `halley-unstable` | main branch | + xdg-desktop-portal-halley |
 
 Both install session files, systemd units, portal config, and D-Bus services.
@@ -59,4 +69,4 @@ nix profile install github:binarylinuxx/halley-flake#halley-unstable
 After installation, select **Halley** from your display manager session list, or run `halley-session` from a TTY.
 
 > [!NOTE]
-> The unstable and dev packages are recommended for users who want the latest fixes, since Halley currently moves fast and releases may lag behind those fixes. 
+> The unstable and dev packages are recommended for users who want the latest fixes, since Halley currently moves fast and releases may lag behind those fixes.

flake.nix

@@ -185,7 +185,19 @@
             version = "0.5.0";
             src = halley-stable-src;
 
-            cargoLock.lockFile = halley-stable-src + "/Cargo.lock";
+            cargoLock = {
+              lockFile = halley-stable-src + "/Cargo.lock";
+
+              outputHashes = {
+                "smithay-0.7.0" =
+                  "sha256-TV/GTfSvgfVwIFUGoASU7xm38opIBLjLMf1HeNTW07U=";
+              };
+            };
+
+            extraBuildInputs = with pkgs; [
+              pipewire
+              dbus
+            ];
 
             runtimeLibs = with pkgs; [
               libglvnd