CI: Add Linux (Ubuntu 24.04) to test matrix

.github/workflows/ci.yml

@@ -6,32 +6,40 @@ on:
   pull_request:
 
 jobs:
-  macos:
-    name: macOS / Ruby ${{ matrix.ruby }}
-    runs-on: macos-14
+  test:
+    name: ${{ matrix.os }} / Ruby ${{ matrix.ruby }}
+    runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.2', '3.3', '3.4']
+        os: [macos-14, ubuntu-24.04]
+        ruby: ["3.2", "3.3", "3.4"]
     steps:
       - uses: actions/checkout@v4
 
       - name: Clone libBeresta (read-only) for codegen + native build
         run: |
           git clone --depth=1 https://github.com/libBeresta/libBeresta.git ../libBeresta
 
-      - name: Install build deps (cmake, libpng, zlib, pkg-config)
+      - name: Install build deps (macOS)
+        if: runner.os == 'macOS'
         run: |
           brew update
           brew install cmake libpng pkg-config
 
+      - name: Install build deps (Linux)
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y cmake libpng-dev zlib1g-dev pkg-config build-essential
+
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
 
-      - name: Build libBeresta.dylib
+      - name: Build libBeresta shared library
         run: |
           cmake -S . -B build \
             -DLIBBRST_SOURCE_DIR=$(cd ../libBeresta && pwd) \

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 ## [Unreleased]
 
+### Added
+- Linux (Ubuntu 24.04) CI: converted the single macOS job into an
+  `os × ruby` matrix covering both macOS 14 and Ubuntu 24.04
+  (addresses the Linux support noted in 0.1.0 Known limitations).
+  No Ruby code changes — `Library.lib_path` already resolves `.so`.
+
 ### Changed
 - Regenerated bindings against upstream naming-convention renames
   (libBeresta PR #64). Six functions renamed on the FFI surface: