Add gem release workflow with GitHub release notes from changelog

.github/workflows/release.yml

@@ -0,0 +1,39 @@
+name: Release
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - lib/factory_bot/version.rb
+
+jobs:
+  release:
+    name: Release gem
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write  # create git tag + GitHub release
+      id-token: write  # OIDC token for RubyGems trusted publishing
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.3"
+      - name: Extract release notes from NEWS.md
+        id: release_notes
+        run: |
+          VERSION=$(ruby -e "require_relative 'lib/factory_bot/version'; puts FactoryBot::VERSION")
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+          NOTES=$(awk "BEGIN{p=0} /^## $VERSION/{p=1; next} p && /^## /{exit} p{print}" NEWS.md)
+          echo "notes<<EOF" >> "$GITHUB_OUTPUT"
+          echo "$NOTES" >> "$GITHUB_OUTPUT"
+          echo "EOF" >> "$GITHUB_OUTPUT"
+      - uses: rubygems/release-gem@v1
+      - name: Create GitHub release
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          gh release create "v${{ steps.release_notes.outputs.version }}" \
+            --title "v${{ steps.release_notes.outputs.version }}" \
+            --notes "${{ steps.release_notes.outputs.notes }}"

.github/workflows/validate-changelog.yml

@@ -0,0 +1,21 @@
+name: Validate changelog
+
+on:
+  pull_request:
+    paths:
+      - lib/factory_bot/version.rb
+
+jobs:
+  validate:
+    name: Check NEWS.md has release section
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Check NEWS.md contains version section
+        run: |
+          VERSION=$(ruby -e "require_relative 'lib/factory_bot/version'; puts FactoryBot::VERSION")
+          if ! grep -q "^## $VERSION" NEWS.md; then
+            echo "ERROR: NEWS.md is missing a section for version $VERSION"
+            echo "Add a '## $VERSION (date)' entry to NEWS.md before bumping the version."
+            exit 1
+          fi