Add release workflow

.github/workflows/release.yml

@@ -0,0 +1,48 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v[0-9]*.[0-9]*.[0-9]*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v6.0.2
+        with:
+          persist-credentials: false
+      - uses: ruby/setup-ruby@afeafc3d1ab54a631816aba4c914a0081c12ff2f  # v1.310.0
+        with:
+          ruby-version: '3.2'
+      - run: gem build komoju-sdk.gemspec
+
+  publish:
+    needs: build
+    runs-on: ubuntu-latest
+    environment: release
+    permissions:
+      contents: write
+      id-token: write   # Required for RubyGems OIDC Trusted Publishing
+    steps:
+      - uses: actions/checkout@v6.0.2
+        with:
+          persist-credentials: false
+      - uses: ruby/setup-ruby@afeafc3d1ab54a631816aba4c914a0081c12ff2f  # v1.310.0
+        with:
+          ruby-version: '3.2'
+      - uses: rubygems/configure-rubygems-credentials@762a4b77c3300434bb57c7ce80b20e36231927aa  # v2.0.0
+      - run: gem build komoju-sdk.gemspec
+      - run: gem push "$(ls komoju-sdk-*.gem | tail -1)"
+      - name: Create GitHub Release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          TAG_NAME: ${{ github.ref_name }}
+        run: |
+          PRERELEASE=""
+          if [[ "$TAG_NAME" == *"beta"* ]] || [[ "$TAG_NAME" == *"alpha"* ]]; then
+            PRERELEASE="--prerelease"
+          fi
+          gh release create "$TAG_NAME" --generate-notes $PRERELEASE