Add Gitea workflow for macOS builds

.gitea/workflows/build.yml

@@ -0,0 +1,34 @@
+name: Build macOS App
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: macos-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Build release configuration
+        run: |
+          xcodebuild \
+            -project iKeyMon.xcodeproj \
+            -scheme iKeyMon \
+            -configuration Release \
+            -derivedDataPath build \
+            clean build
+
+      - name: Package app bundle
+        run: |
+          mkdir -p artifacts
+          cd build/Build/Products/Release
+          zip -r "../../../../artifacts/iKeyMon.app.zip" iKeyMon.app
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: iKeyMon-macos-app
+          path: artifacts/iKeyMon.app.zip