Add macOS build and release workflow

.github/workflows/macos_build.yml

@@ -0,0 +1,58 @@
+name: macOS Build and Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: macos-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.10.0'
+          channel: 'stable'
+          architecture: x64
+
+      - name: Install create-dmg
+        run: brew install create-dmg
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Build macOS
+        run: flutter build macos --release
+
+      - name: Create DMG
+        run: |
+          APP_NAME="todo_app"
+          DMG_NAME="${APP_NAME}_macos.dmg"
+          
+          # Create DMG
+          create-dmg \
+            --volname "$APP_NAME" \
+            --window-pos 200 120 \
+            --window-size 800 400 \
+            --icon-size 100 \
+            --app-drop-link 600 185 \
+            "$DMG_NAME" \
+            "build/macos/Build/Products/Release/$APP_NAME.app"
+      
+      - name: Create Release
+        id: create_release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: |
+            todo_app_macos.dmg
+          draft: false
+          prerelease: false
+          generate_release_notes: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}