Add release workflows

.github/workflows/release.yml

@@ -0,0 +1,42 @@
+name: CI
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  build:
+
+    runs-on: macos-latest
+
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+          fetch-depth: 0
+
+      - name: Build
+        run: |
+          brew install automake
+          make VERSION="${GITHUB_REF_NAME}" release
+          make release-dmg 
+          shasum -a 256 build/Release/ShadowsocksX-NG.dmg > build/Release/ShadowsocksX-NG.dmg.checksum
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: ShadowsocksX-NG
+          path: |
+            build/Release/ShadowsocksX-NG.dmg
+            build/Release/ShadowsocksX-NG.dmg.checksum
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        with:
+          generate_release_notes: true
+          files: |
+            build/Release/ShadowsocksX-NG.dmg
+            build/Release/ShadowsocksX-NG.dmg.checksum