add GitHub release workflow (#28)

using RubyGems Trusted Publishers

.github/workflows/release.yml

@@ -0,0 +1,46 @@
+name: Release a New Version
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: "New Version. major|minor|patch|rc or an explicit version number."
+        required: true
+        default: patch
+        type: string
+
+permissions:
+  contents: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}
+  cancel-in-progress: true
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      id-token: write
+    outputs:
+      new_version: ${{ steps.bump_version.outputs.new_version }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - uses: git-actions/set-user@v1
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.2
+          bundler-cache: true
+          rubygems: latest
+      - name: Bump version
+        id: bump_version
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          bundle config unset deployment
+          bundle exec gem bump -v ${{ inputs.version }} -m "v%{version}"
+          bundle install
+          git add Gemfile.lock Gemfile.ruby-2.6.lock
+          git commit --amend --no-edit
+      - uses: rubygems/release-gem@v1

Gemfile.lock

@@ -13,6 +13,7 @@ GEM
       irb (~> 1.10)
       reline (>= 0.3.8)
     diff-lcs (1.5.0)
+    gem-release (2.2.2)
     io-console (0.7.2)
     irb (1.11.0)
       rdoc
@@ -91,6 +92,7 @@ PLATFORMS
 DEPENDENCIES
   bundler-multilock!
   debug (~> 1.9)
+  gem-release (~> 2.2)
   irb (~> 1.11)
   rake (~> 13.0)
   rspec (~> 3.12)

Gemfile.ruby-2.6.lock

@@ -11,6 +11,7 @@ GEM
       irb (>= 1.5.0)
       reline (>= 0.3.1)
     diff-lcs (1.5.0)
+    gem-release (2.2.2)
     io-console (0.7.2)
     irb (1.6.3)
       reline (>= 0.3.0)
@@ -42,6 +43,7 @@ PLATFORMS
 DEPENDENCIES
   bundler-multilock!
   debug (= 1.8.0)
+  gem-release (~> 2.2)
   irb (= 1.6.3)
   rake (~> 13.0)
   rspec (~> 3.12)

bundler-multilock.gemspec

@@ -18,6 +18,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency "bundler", ">= 2.4.19", "< 2.6"
 
+  spec.add_development_dependency "gem-release", "~> 2.2"
   spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "rspec", "~> 3.12"
 end