Add push.yml workflow for RubyGems trusted publishing

Also fix gemspec changelog reference from CHANGES.md to CHANGELOG.md.

Author: sferik

.github/workflows/push.yml

@@ -0,0 +1,39 @@
+name: Push gem to RubyGems
+
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: read
+
+jobs:
+  push:
+    if: github.repository == 'httprb/form_data'
+    runs-on: ubuntu-latest
+
+    environment:
+      name: rubygems.org
+      url: https://rubygems.org/gems/http-form_data
+
+    permissions:
+      contents: write
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ruby
+          bundler-cache: true
+
+      - uses: rubygems/release-gem@v1
+
+      - name: Create GitHub release
+        run: |
+          tag_name="$(git describe --tags --abbrev=0)"
+          gh release create "${tag_name}" --verify-tag --generate-notes
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

http-form_data.gemspec

@@ -21,12 +21,12 @@ Gem::Specification.new do |spec|
   spec.metadata["homepage_uri"]          = spec.homepage
   spec.metadata["source_code_uri"]       = "#{spec.homepage}/tree/v#{spec.version}"
   spec.metadata["bug_tracker_uri"]       = "#{spec.homepage}/issues"
-  spec.metadata["changelog_uri"]         = "#{spec.homepage}/blob/v#{spec.version}/CHANGES.md"
+  spec.metadata["changelog_uri"]         = "#{spec.homepage}/blob/v#{spec.version}/CHANGELOG.md"
   spec.metadata["documentation_uri"]     = "https://www.rubydoc.info/gems/http-form_data/#{spec.version}"
   spec.metadata["rubygems_mfa_required"] = "true"
 
   spec.files = IO.popen(%w[git ls-files -z], chdir: __dir__, err: IO::NULL) do |ls|
-    extras = %w[CHANGES.md LICENSE.txt README.md] << File.basename(__FILE__)
+    extras = %w[CHANGELOG.md LICENSE.txt README.md] << File.basename(__FILE__)
 
     ls.readlines("\x0", chomp: true).select do |f|
       f.start_with?("lib/", "sig/") || extras.include?(f)