Add GitHub Actions for CI and releases

- CI workflow: builds on push/PR to main
- Release workflow: creates universal binary on tag push

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: mkuliszkiewicz

.github/workflows/ci.yml

@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    name: Build
+    runs-on: macos-14
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Swift
+        uses: swift-actions/setup-swift@v2
+        with:
+          swift-version: '5.9'
+
+      - name: Build
+        run: swift build
+
+      - name: Build Release
+        run: swift build -c release

.github/workflows/release.yml

@@ -0,0 +1,39 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build:
+    name: Build macOS Binary
+    runs-on: macos-14
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Swift
+        uses: swift-actions/setup-swift@v2
+        with:
+          swift-version: '5.9'
+
+      - name: Build Release Binary
+        run: swift build -c release --arch arm64 --arch x86_64
+
+      - name: Package Binary
+        run: |
+          mkdir -p release
+          cp .build/apple/Products/Release/xcode-theme-generator release/
+          cd release
+          tar -czvf xcode-theme-generator-macos.tar.gz xcode-theme-generator
+          cd ..
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v1
+        with:
+          files: release/xcode-theme-generator-macos.tar.gz
+          generate_release_notes: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}