Add GitHub Actions workflow from https://oxidize-rb.org/docs/deployment/#cicd-release-workflow

Author: bangseongbeom

.github/workflows/release.yml

@@ -0,0 +1,68 @@
+# .github/workflows/release.yml
+name: Gem Release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        ruby: ["3.0", "3.1", "3.2", "3.3"]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: oxidize-rb/actions/setup-ruby-and-rust@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - run: bundle exec rake compile
+      - run: bundle exec rake test
+
+  cross-compile:
+    needs: [test]
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: ["x86_64-linux", "aarch64-linux", "x86_64-darwin", "arm64-darwin", "x64-mingw-ucrt"]
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.1"
+      - uses: oxidize-rb/actions/cross-gem@v1
+        with:
+          platform: ${{ matrix.platform }}
+      - uses: actions/upload-artifact@v6
+        with:
+          name: gem-${{ matrix.platform }}
+          path: pkg/*-${{ matrix.platform }}.gem
+
+  release:
+    needs: cross-compile
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@v7
+        with:
+          path: artifacts
+      - name: Move gems to pkg directory
+        run: |
+          mkdir -p pkg
+          find artifacts -name "*.gem" -exec mv {} pkg/ \;
+      - name: Publish to RubyGems
+        env:
+          RUBYGEMS_API_KEY: ${{ secrets.RUBYGEMS_API_KEY }}
+        run: |
+          mkdir -p ~/.gem
+          echo "---
+          :rubygems_api_key: ${RUBYGEMS_API_KEY}" > ~/.gem/credentials
+          chmod 0600 ~/.gem/credentials
+          for gem in pkg/*.gem
+          do
+            gem push $gem
+          done