Add GitHub Actions workflow for automated gem releases and changelog updates

Author: Syati

.github/workflows/release.yml

@@ -0,0 +1,91 @@
+name: Release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+    - uses: actions/checkout@v5
+      with:
+        fetch-depth: 0
+        token: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: '3.4'
+        bundler-cache: true
+
+    - name: Extract version from tag
+      id: version
+      run: |
+        VERSION=${GITHUB_REF#refs/tags/v}
+        echo "version=$VERSION" >> $GITHUB_OUTPUT
+        echo "tag_name=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+
+    - name: Validate version consistency
+      run: |
+        GEMSPEC_VERSION=$(ruby -r "./lib/structured_params/version" -e "puts StructuredParams::VERSION")
+        if [ "$GEMSPEC_VERSION" != "${{ steps.version.outputs.version }}" ]; then
+          echo "Version mismatch: tag ${{ steps.version.outputs.version }} vs gemspec $GEMSPEC_VERSION"
+          exit 1
+        fi
+
+    - name: Build gem
+      run: gem build structured_params.gemspec
+
+    - name: Publish to RubyGems
+      run: |
+        mkdir -p $HOME/.gem
+        touch $HOME/.gem/credentials
+        chmod 0600 $HOME/.gem/credentials
+        printf -- "---\n:rubygems_api_key: ${GEM_HOST_API_KEY}\n" > $HOME/.gem/credentials
+        gem push *.gem
+      env:
+        GEM_HOST_API_KEY: ${{ secrets.RUBYGEMS_API_KEY }}
+
+    - name: Update CHANGELOG
+      run: |
+        # Extract release notes from GitHub release
+        RELEASE_NOTES=$(curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+          "https://api.github.com/repos/${{ github.repository }}/releases/tags/${{ steps.version.outputs.tag_name }}" \
+          | jq -r '.body // ""')
+        
+        # Get current date
+        CURRENT_DATE=$(date +%Y-%m-%d)
+        
+        # Create temporary file with new changelog entry
+        cat > temp_changelog.md << EOF
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [${{ steps.version.outputs.version }}] - $CURRENT_DATE
+
+$RELEASE_NOTES
+
+EOF
+        
+        # Append existing changelog content (skip the header)
+        tail -n +9 CHANGELOG.md >> temp_changelog.md
+        mv temp_changelog.md CHANGELOG.md
+
+    - name: Commit and push CHANGELOG update
+      run: |
+        git config --local user.email "action@github.com"
+        git config --local user.name "GitHub Action"
+        git add CHANGELOG.md
+        if git diff --staged --quiet; then
+          echo "No changes to commit"
+        else
+          git commit -m "Update CHANGELOG for v${{ steps.version.outputs.version }}"
+          git push origin main
+        fi