add release workflow

.github/workflows/release.yml

@@ -0,0 +1,38 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v4
+      - name: Build binaries
+        run: |
+          mkdir -p dist
+          GOOS=darwin GOARCH=amd64 go build -o dist/sbx-darwin-amd64 .
+
+      - name: Create GitHub Release
+        id: create_release
+        uses: actions/create-release@v1
+        with:
+          tag_name: ${{ github.ref_name }}
+          release_name: ${{ github.ref_name }}
+          body: |
+            This is an automated release for version ${{ github.ref_name }}.
+          draft: false
+          prerelease: false
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Upload macOS binary
+        uses: actions/upload-release-asset@v1
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: dist/sbx-darwin-amd64
+          asset_name: sbx-darwin-amd64
+          asset_content_type: application/octet-stream

.gitignore

@@ -1 +1,2 @@
 sbx
+dist